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!S.Tracker/STDocs4.07
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File contents
!S/Tracker (Soundtracker/Tracker module music player)
-----------------------------------------------------
Version 4.07 (24 Jan 1991)
Originally written by Hugo Fiennes and Fabrice Mercier [(c) The Serial Port]
SWI interface and other bits added by Matt Farrow
Feel free to use this module in any p.d. demos or programs etc., and for
inclusion with commercial programs if needed (but let us know first!!)
Much time and effort has been spent on developing this module (for no
commercial gain), and it would be a courtesy if you could credit the authors
whenever you use it, and inform us if you intend to distribute it on a large
scale.
The !S/Tracker application is a P.D. application, and may be freely copied
if nothing more than the cost of a disc and a small amount for the trouble is
charged, but it must be distributed with all the files complete and unchanged
(with the possible exception of the 'STDocsX/XX' file).
Overview
--------
The module exists principally to support the multi-tasking playing of
both the Serial Port Tracker and amiga Sound/Protracker music module formats.
Via either a full command line interface, or using SWI's (with desktop
front-ends if desired), a whole range of operations can be performed (such
as setting the stereo position; fading in and fading out; playing sound
effects; changing the sample quality; monitoring the state of each channel,
etc.).
As mentioned earlier, the module will play (and automatically detect)
several different formats:
1) Archimedes Tracker - A full implementation differing from the original
routines only in ways which are an improvement (ie. volume slides
of 1 don't cause distortion).
Tracker tunes are not converted in any way when they are loaded,
and so are preserved in memory (suitable for editing).
2) Amiga formats (soundtracker 15/31 inst, protracker) -
From version 4.06 onwards these are replayed as accurately as
possible (including volumes), with the unimplemented commands
being 5-7, 9, E (mostly unused or h/w dependent anyway).
When an amiga format tune is loaded, it is converted before
being played (the pattern data is converted into Tracker format
data, except any volume or slide commands are preserved).
You should not, therefore, save soundtracker tunes while they are
playing or in pause mode, but if they have been 'MemoryLoad'ed
they will be converted back after a *PlayStop etc. (but any
instruments out of range [32-36] etc. will be ignored/mis-
converted).
This documentation was written to accompany the !S/Tracker application
containing the latest Trackermodule ('PM') and not much else (this was so
that file lengths could be kept down and the module made reasonably easy to
distribute). It was intended that 3rd party PD writers could write their own
front-ends for the module and keep the interfaces 'clean' so that it is a
simple task to keep up with changes in the Tracker format, for example, by
just replacing the module in the application directory.
DOCUMENTATION OF * COMMANDS AND SWI's
-------------------------------------
*PlayMod - Loads into memory and starts to play the specified Tracker or
Soundtracker module, determining automatically which format it
is.
Syntax: *PlayMod <filename>
*PlayPause - Will pause the currently playing tune (kills all sound immed-
iately) but retains the soundtracker/tracker module in memory.
The tune can be restarted with a *PlayStart command.
Syntax: *PlayPause
*PlayStart - Will resume playing a tune after a *PlayPause command.
Syntax: *PlayStart
*PlayPos - Will set the current position in the sequence table, or if no
parameter is given, will simply return the current position.
Syntax: *PlayPos [<0-127>]
*PlaySamples - Will list all the samples associated with the currently
installed music module.
Syntax: *PlaySamples
*PlaySpeed - Will change the sample playback rate and therefore vary the
approximate amount of CPU time taken up by the playroutine.
Currently, the only four options are:
0 - normal sample rate
1 - half sample rate
2 - normal sample rate (for VIDC enhancers)
3 - half sample rate (for VIDC enhancers)
If option 1 or 3 is selected, the sample quality is reduced,
but 8 channel tunes will take up only a little more time than
4 channel tunes originally.
The function of *PlaySpeed is duplicated by the SWI
'Tracker_Speed' (see later).
Syntax: *PlaySpeed <0|1|2|3>
*PlayStatus - Will print information about the current tune module loaded
Syntax: *PlayStatus
*PlayStereo - Controls the stereo settings while the older format sound-
tracker modules are playing (the stereo is fixed on an Amiga),
and will switch between five possible settings to cater for
most configurations:
0 - Slightly off-centre left and right (normal)
1 - Fully left and right (amiga-style)
2 - Fully left
3 - Fully right
4 - Don't alter stereo settings
(normally alters settings when a tune is loaded and when it plays a tracker stereo command - see
SWI Tracker_Stereo)
Syntax: *PlayStereo <0|1|2|3>
*PlayStop - Will stop and kill the currently playing tune module,
removing it from memory.
Syntax: *PlayStop
*PlayVolume - Changes the overall loudness of any tunes playing. The scale
is logarithmic and goes from 1 (silent) to 127 (full volume).
*PlayVolume with no parameters displays the current volume.
Syntax: *PlayVolume [<0-127>]
SWI COMMANDS
------------
Several SWI commands have been added to the module in order to simplify the
task of adding soundtracker/tracker music to your demos etc. (especially
multi-tasking situations). These provide all of the facilities offered by
the various * commands, but also allow a more detailed control of some of the
module's features.
All the SWI's remain in SVC mode, and do not alter the interrupt status.
I think most are re-entrant, except those which use system SWI's (load, play,
stop etc.), so avoid calling them from interrupts if you can avoid it.
The SWI chunk number given here (&43200) is an officially recognised chunk
number issued by Acorn.
-----------------------------------------------------------------------------
Tracker_Version (SWI &43200)
-----------------------------------------------------------------------------
On Entry: -
On Exit : R0 = version number*100 (ie. for V1.23 = 123)
Use this call to ensure that the trackermodule installed is a recent enough
version to support the SWI's you wish to use. Versions 4.00 onwards incorpor-
ate the SWI's.
-----------------------------------------------------------------------------
Tracker_Load (SWI &43201)
-----------------------------------------------------------------------------
On Entry: R0 = pointer to filename of soundtracker/tracker module
On Exit : R0 preserved
This call will claim memory from the RMA and load the specified tune module,
initialise the sound system, and set the playroutine in pause mode.
You must then use the SWI Tracker_Play to start the tune playing.
The command *PlayMod calls this routine, and then the SWI Tracker_Play.
An error will be generated if the module cannot be loaded or not enough
memory can be claimed.
-----------------------------------------------------------------------------
Tracker_MemoryLoad (SWI &43202)
-----------------------------------------------------------------------------
On Entry: R0 = pointer to first word of soundtracker/tracker module in
memory (NB must be word-aligned)
R1 = length of module in bytes
On Exit : R0 and R1 preserved
This call can be used by a non-multitasking application to specify an area
of memory as a tune module, and thereby remove the need for a seperate file
to hold a tune, and there is no need to claim a large amount of RMA space.
Once this SWI is called, the module will be treated as if it was loaded in
the module's own workspace.
Important: You must tell the trackermodule to forget the module if the
memory will be overwritten, otherwise the module may crash.
(*PlayStop or Tracker_Stop SWI)
NB This call will not work for programs running under the desktop if the
module is loaded in user memory.
When a soundtracker module is loaded, the pattern data is converted to
Tracker format data (except for volumes which remain 0-64), so
for the purposes of editing, as long as Tracker_Read/WriteSampleTable are
used, the module can be considered as a Tracker module. When SWI
Tracker_Stop/*PlayStop is called, the data is converted back.
-----------------------------------------------------------------------------
Tracker_Play (SWI &43203)
-----------------------------------------------------------------------------
On Entry: -
On Exit : -
This call will restart a tune after it has been paused or loaded with the
Tracker_Load SWI.
-----------------------------------------------------------------------------
Tracker_Stop (SWI &43204)
-----------------------------------------------------------------------------
On Entry: -
On Exit : -
This performs the same actions as *PlayStop
Using *PlayStop or this SWI is the only way to get the trackermodule to
release the memory taken up by the tune module, or to force it to forget the
address of a module if it has been loaded with the 'Tracker_MemoryLoad' SWI.
If the module is soundtracker and has been loaded with Tracker_MemoryLoad,
calling this SWI or *PlayStop will convert the data back to the original
format.
-----------------------------------------------------------------------------
Tracker_Pause (SWI &43205)
-----------------------------------------------------------------------------
On Entry: -
On Exit : -
This performs the same actions as *PlayPause
-----------------------------------------------------------------------------
Tracker_Stereo (SWI &43206)
-----------------------------------------------------------------------------
On Entry: R0 = Stereo setting (0-4) or -1 to read current setting
On Exit : If R0>=0 on entry: R0 preserved
If R0=-1 on entry: R0 = current PlayStereo setting
R1 = pointer to 8-byte stereo position table
This performs the same actions as *PlayStereo, with R0 passed as a parameter.
If R0 is set to 4 on entry, then the stereo settings will be unaltered
whenever a module is loaded or killed, and disables any stereo commands in
tracker modules. This is to allow interfacing programs to provide their own
stereo options, or to allow adjustment to the stereo positions while tracker
tunes are playing (which have default stereo settings stored as part of the
tune).
Alternatively, if R0=-1 on entry, R0 will be the last parameter passed to
this SWI or the *PlayStereo command, and R1 points to an 8-byte table (one
byte per channel) which is updated every time either a tune starts; this SWI
or *PlayStereo is called with a parameter of 0-3; or if a stereo command is
executed in a Tracker tune. The byte will be in the range of 1-7 (where 1 is
full left, 7 is full right, and 4 is centre). Some Tracker tunes may contain
stereo settings out of range.
-----------------------------------------------------------------------------
Tracker_SetPos (SWI &43207)
-----------------------------------------------------------------------------
On Entry: R0 = New sequence position (0-127 max)
R1 = Event (0-63 max)
On Exit : R0 preserved
This performs the same actions as *PlayPos, except that the event with the
pattern can be specified (0-63 normally). If an event number higher than the
number of events in the current pattern is specified, the pattern will begin
at event 0.
If there is no tune currently loaded, an error is generated.
-----------------------------------------------------------------------------
Tracker_ReadPos (SWI &43208)
-----------------------------------------------------------------------------
On Entry: -
On Exit : R0 = Current position in sequence table (0-127 max)
R1 = Current position in pattern (0-63 max)
R2 = Maximum position in sequence table
This performs the same actions as *PlayPos with no parameters, but also
returns the current position in the current pattern (in case some applic-
ations need to synchronize events with the tune being played).
-----------------------------------------------------------------------------
Tracker_PlayNote (SWI &43209)
-----------------------------------------------------------------------------
On Entry: R0 = Sound channel to sound note on (1-8 max)
R1 = Tracker format note number (1-36)
R2 = Sample to play (1-36)
R3 = Volume (0-255) [Tracker volume even if soundtracker tune
loaded].
On Exit : R0-R3 preserved
If tune not paused then C flag set otherwise C flag cleared.
If there is no tune loaded, an error will be generated.
It plays one of the samples which are part of the paused tune at a given
pitch (1=low, 36=high) and volume (0=silent, 255=loud). If any of the values
are out of range, an error will be reported.
The number of sound channels that can be used depends on the module loaded
(soundtracker modules will always use 4 voices, whereas Tracker modules can
use up to 8).
Use the Tracker_TuneInfo SWI to find out the maximum number of voices if you
intend to play more than one note at a time.
NB This call should be avoided if possible, unless the purpose is to hear
each sample seperately.
-----------------------------------------------------------------------------
Tracker_TuneInfo (SWI &4320A)
-----------------------------------------------------------------------------
On Entry: -
On Exit : R0 = Sequence table length (1-128)
R1 = Number of voices (1-8)
R2 = Current speed (1-15)
R3 = Pointer to tune name (terminated by 0, max length 32 chars)
R4 = Pointer to author's name (0 terminated, max length 32 chars)
or zero if soundtracker format module (not applicable)
R5 = Address of currently loaded tune module
If the tune is paused, the C flag is set, otherwise the C flag is
cleared.
If there is no tune loaded, R0 is set to zero, and R1-R5 are
preserved.
This call provides miscellaneous information about the tune currently loaded.
You should not need to directly access the tune module (using the address
passed in R5), because all information is available via the various SWI's,
and soundtracker format modules will have been converted partially to Tracker
format when loaded (and therefore in an unknown format). This information is
provided if, for example, multi-tasking players/editors need to know if the
tune currently playing is running from ordinary RMA, or the player's/editor's
own workspace.
-----------------------------------------------------------------------------
Tracker_SoundInfo (SWI &4320B)
-----------------------------------------------------------------------------
On Entry: R0 = Pointer to word-aligned 256 byte block to hold sound data
On Exit : R0 preserved
if the tune is paused, the C flag will be set, otherwise the C
flag will be cleared.
If there is no tune loaded an error will be generated.
This call is only provided for advanced uses of the trackermodule, and
involves information of a highly technical nature. It is advised that you
do not use this call if you can avoid it.
The call will transfer the current contents of the sound voice info table
to the location pointed to by R0. 256 bytes (64 words) will be transferred
in total (8 words per sound channel), regardless of the number of voices
actually active.
When a note is played and then ends, word 6 of the appropriate channel is
zeroed. The sound routines will only try and play the sample if this word is
non-zero.
When a tune is paused, the block is saved and overwritten with zeros. When
the tune is restarted, the old contents are restored, so that the samples
will continue to play from the same point.
The format of the table is as follows:-
Word Offset Sound channel 1...
0 +0 The current pitch accumulator. (shift right 16 bits to get the
actual byte offset into the sample being played).
1 +4 The current pitch increment (added to accumulator after every
byte filled). This is obtained using internal tables given the
sample period (word 7)
2 +8 The sample loop offset (given in bytes). When the routine
reaches the end of a sample or the sample length, the accumul-
ator is loaded with this value shifted left 16 bits (ie. to
give a byte offset). If this is a zero value, the sample will
stop instead of looping.
3 +12 The sample length / repeat length (in bytes). The routine
checks every 4 bytes filled to see if the current accumulator
exceeds this value when shifted right 16 bits. (See above)
4 +16 The sample number (1-36).
5 +20 The current volume (0-255). This value is subtracted from every
byte filled, therefore 0 = maximum volume and 255 = silent.
NB This is the reverse of the normal volume command.
6 +24 This is the tracker format note number of the sample being
played (1-36, 1=C octave 1 36=B octave 3). The arpeggio command
makes use of this word. If this word is zero, no sound will be
played.
7 +28 This is a copy of the sample period (from which the pitch
increment value is calculated), and is used by the portamento
commands. The range of the sample period is from 1 to hex &400
(although the portamento commands have smaller limits in
practice).
8 +32 Word 0 of sound channel 2...
9 +36 Word 1 of sound channel 2... etc.
-> word 8 of sound channel 8
-----------------------------------------------------------------------------
Tracker_ReadSampleTable (SWI &4320C)
-----------------------------------------------------------------------------
On Entry: R0 = Sample number (1-36)
On Exit : R0 preserved
R1 = Pointer to sample name (0-terminated, max length 22 chars)
R2 = Sample volume (0-255, 255=maximum volume, 0=silent)
(or 0-64 [soundtracker], 64=max vol.)
R3 = Sample length (bytes)
R4 = Repeat offset (bytes)
R5 = Repeat length (bytes)
R6 = Address of raw sample data
This call returns all relevant information about the specified sample.
If there is no tune loaded, an error will be generated.
If the sample number is out of range (for example, if reading sample 16 on a
15-instrument module), R1 and R6 will point to a zero, and R2-R5 will contain
a zero.
-----------------------------------------------------------------------------
Tracker_WriteSampleTable (SWI &43213)
-----------------------------------------------------------------------------
On Entry: R0 = Sample number (1-36)
R1 = New sample volume (0-255/0-64) or -1 to leave unchanged.
R2 = Repeat offset (bytes) or -1 to leave unchanged.
R3 = Repeat length (bytes) or -1 to leave unchanged.
You should use this SWI if you wish to alter the sample data without needing
to know the relevant module format. Sample length is not alterable, because
the occasions when this is necessary (eg. loading new sample in) need
direct manipulation of the module in memory anyway, and problems occur when
the sample length is set above the actual length.
Versions between 3.00 and 4.05 copied the sample information into a more
convenient format when the module was initialised, and so altering the data
directly would have had no effect (causing problems for editors which needed
to do this..).
Should you wish to alter any other aspect of the module directly which might
affect the playroutine (ie. number of voices), you should call
'Tracker_UpdateData' (see below..).
An error is generated if:
* No module is loaded
* The sample number to change exceeds the max. of the format (ie. 15/31/36)
* The relevant information is out of range (ie. vol > [64 or 255])
* A combination of repeat offset and repeat length would cause the player
to loop outside the sample limit.
This SWI is part of the locking system.
-----------------------------------------------------------------------------
Tracker_Lock (SWI &4320D)
-----------------------------------------------------------------------------
On Entry: R0 = locking code (passed in R4 to SWI's)
On Exit : -
This SWI and the corresponding Tracker_Unlock SWI are provided to
prevent user intervention with any of the features of the module when this
would be undesirable for any multi-tasking applications using the module
(for example issuing a *PlayStop command). By calling this SWI, an applic-
ation can gain complete control of the module, but as a result, this feature
must be used carefully, because the module cannot then be unlocked unless
the code specified in the lock SWI is known (and if not, the module must be
re-initialised).
When the module is locked, calling any commands or SWI's which alter
anything (such as changing the current play position, loading or killing
tunes, playing notes) will cause an error, but SWI's returning information
will function as normal. For the application which is responsible for the
locking to be able to use the affected SWI's, R4 must be set to the locking
code (passed in R0) before any of the affected SWI's is called (no commands
will work even if the locking code is known).
If the trackermodule is already 'locked' when this SWI is called, an error
will be generated.
It is advisable to avoid using this call unless absolutely neccessary.
The restricted commands are:
*PlayMod, *PlayPause, *PlayStart, *PlayPos, *PlayStereo, *PlayStop,
*PlayVolume.
The restricted SWI's are:
Tracker_Load, Tracker_MemoryLoad, Tracker_Play, Tracker_Stop, Tracker_Stereo,
Tracker_SetPos, Tracker_PlayNote, Tracker_Volume.
-----------------------------------------------------------------------------
Tracker_Unlock (SWI &4320E)
-----------------------------------------------------------------------------
On Entry: R0 = locking code (specified in Tracker_Lock)
On Exit : -
This SWI should be called to unlock the module after it has been locked with
'Tracker_Lock'. If the value passed in R0 is different to the locking code
given in the lock SWI, or the module has not been locked, an error is
generated.
-----------------------------------------------------------------------------
Tracker_MuteChannel (SWI &4320F)
-----------------------------------------------------------------------------
On Entry: R0 = channel to mute (1-8)
On Exit : -
This SWI allows you to turn off selected channels while leaving all the
other channels unaffected. The channels can be turned back on by using the
'Tracker_RestoreChannel' SWI.
No error is generated if the channel number is higher than the number of
channels actually being used by the trackermodule.
-----------------------------------------------------------------------------
Tracker_RestoreChannel (SWI &43210)
-----------------------------------------------------------------------------
On Entry: R0 = channel to turn on (1-8)
On Exit : -
This SWI will reverse the effect of a 'Tracker_MuteChannel' SWI, and turn
the selected channel back on.
No error is generated if the channel number is higher than the number of
channels actually being used by the trackermodule.
-----------------------------------------------------------------------------
Tracker_Speed (SWI &43211)
-----------------------------------------------------------------------------
On Entry: R0 = new speed setting (0-3)
On Exit : -
This SWI will select the future sample rate and overall pitch to cater for
VIDC enhancers and 8-channel tunes, taking effect immediately if a tune is
currently playing.
For details of the different options see the command *PlaySpeed.
This SWI is not included in the locking system because it was only intro-
duced in version 4.04, and some programs may have already been written which
use the locking system but don't control the sample speed/pitch etc.
-----------------------------------------------------------------------------
Tracker_Volume (SWI &43212)
-----------------------------------------------------------------------------
On Entry: R0 = new overall volume (0-127) or -1 to read volume
On Exit : R0 = old volume
This SWI will set the overall volume of any tunes playing by subtracting
(254-volume*2) from the volume of any sample playing. This takes effect
immediately, and also affects samples which are in mid-play.
Calling the SWI with R0=-1 will return the current volume in R0.
You can use this SWI to provide smooth fade-outs and fade-ins, for example.
This SWI is part of the locking system.
-----------------------------------------------------------------------------
Tracker_TranslateVolume (SWI &43214)
-----------------------------------------------------------------------------
On Entry: R0 = Soundtracker volume to convert (0-64)
On Exit : R0 = Logarithmic volume (0-255), 255=max.
This SWI will convert a soundtracker volume (as returned by the SWI
Tracker_ReadSampleTable when a soundtracker tune is playing) into a Tracker
format logarithmic volume (0-255).
-----------------------------------------------------------------------------
Tracker_UpdateData (SWI &43215)
-----------------------------------------------------------------------------
On Entry: -
On Exit : -
This is really an editor SWI which you should call whenever you alter one of
the following, so that the module can update its data:-
* Number of voices (and therefore pattern length)
* Sample length/load new sample
* Music length
* Stereo settings (Tracker)
=============================================================================
Note translation table
----------------------
The tracker format note numbers and the notes they refer to are as follows:
no. note sample period
--- ---- -------------
1 C -1 &358
2 C#-1 &328
3 D -1 &2FA
4 D#-1 &2D0
5 E -1 &2A6
6 F -1 &280
7 F#-1 &25C
8 G -1 &23A
9 G#-1 &21A
10 A -1 &1FC
11 A#-1 &1E0
12 B -1 &1C5
13 C -2 &1AC
14 C#-2 &194
15 D -2 &17D
16 D#-2 &168
17 E -2 &153
18 F -2 &140
19 F#-2 &12E
20 G -2 &11D
21 G#-2 &10D
22 A -2 &FE
23 A#-2 &F0
24 B -2 &E2
25 C -3 &D6
26 C#-3 &CA
27 D -3 &BE
28 D#-3 &B4
29 E -3 &AA
30 F -3 &A0
31 F#-3 &97
32 G -3 &8F
33 G#-3 &87
34 A -3 &7F
35 A#-3 &78
36 B -3 &71
=============================================================================
Tracker and Soundtracker commands
---------------------------------
In all tunes, there are special commands which have a type (0-&F for amiga,
0-9 & A-Z for Tracker) and data (usually presented as a hex byte, ie. &XX),
which is sometimes treated as two seperate nibbles (ie. arpeggio).
A list of the commands found in Tracker/STracker tunes is as follows:
Command Effect
------- ------
0 (both) Arpeggio -
note2=base note+(first digit of data) semitones
note3= " " +(second " " " ) "
Play note3 for one vsync, then note2, base note, note3, note2
and then the base note to achieve a chord effect (ie. C-2
with command 0 data '&47' (hex) would play a major
arpeggio of C-2, E-2, G-2. If the speed is less than 6,
the arpeggio will be cut short.
1 (both) Pitch slide (portamento up) -
while the command is playing, DECREMENT the sample period by
<parameter> (0-15 usually). This has the effect of INCREASING
the pitch smoothly without restarting the sample. Note that
the pitch gained by a fixed change to the sample period is not
constant over the 3 octaves.
2 (both) Pitch slide (portamento down) -
like command 1 but slides the pitch down.
3 (amiga only) Portamento -
Sounds similar to commands 1 & 2, but behaves differently.
When you use command 3 with a note specified, the note is not
played, but the pitch of the note is set as the 'goal' of the
portamento. Then, whenever a command 3 comes up, the pitch is
automatically slided in the appropriate direction by the value
last given as a parameter for command 3, until the 'goal' is
met, and further command 3's will have no effect.
4 (amiga only) Vibrato -
This causes the pitch to rise and fall in a warbling effect.
The first digit gives the speed of the pitch change (1=slow,
&F=fast), and the second digit gives the magnitude of the
vibrato. The vibrato is created by altering the pitch of the
channel by a sinusoidally varying amount (-ve and +ve).
5,6,7 (amiga) Combinations of the volume and pitch slides (Not implemented)
9 (amiga only) Set sample offset (Not implemented).
A (amiga) Volume slide -
If the first nibble is non-zero, add this value to the current
volume every vsync, else subtract the second nibble in a
similar fashion.
G, H (Tracker) Volume slide up, down -
These commands are the same as the A command on the amiga, but
take a byte parameter.
B (amiga), J (Tracker) Position jump -
When this command is met, jump to position <parameter> in
song.
B (Tracker) Break pattern -
=amiga command D
C (amiga), V (Tracker) Set volume -
Alters the current volume of the channel to the value spec-
ified (0-64 amiga, 0-255 arc). Volume 0 means mute sound.
D (amiga), B (Tracker) Break pattern -
When this command is encountered, the pattern is ended, and
the next pattern jumped to.
E (amiga) Various commands (ie. h/w filter commands) [Not implemented].
E (Tracker) Set stereo -
Set the stereo position (1-7) of the current sound channel
(1-8).
F (amiga), S (Tracker) Set speed -
Sets the speed (number of vsyncs between events) to <param.>.
=============================================================================
Errors
------
The error numbers and messages which the trackermodule may generate:
No tune loaded (&43200) - an operation was attempted which requires a
tune to be loaded into memory beforehand
using *PlayMod or SWI Tracker_Load.
Sequence position out of range - The sequence position given with *PlayPos
(&43201) or SWI Tracker_SetPos was higher than the
actual number of patterns in the song.
No room for module (&43202) - The trackermodule could not claim enough
RMA workspace to load the module. To get
more memory, quit basic to the supervisor
prompt, and retry. If you are using the
desktop instead, remove an application and
retry.
Channel number out of range - The sound channel number was not a value
(&43203) between 1 and the number of sound channels
used for that particular tune.
Sample number out of range - The sample number was not within the range
(&43204) of 1-36.
Note number out of range - The note number was not within the range of
(&43205) 1-36.
Volume out of range (&43206) - The volume was not within the range of 0-255
Module already locked (&43207) - Tracker_Lock was called when the module
was already locked. The module can only be
unlocked when the application in control of
the module issues a Tracker_Unlock SWI.
Unlock failed (&43208) - Tracker_Unlock was called but either
the wrong locking code was specified, or
the module was not locked at the time.
TrackerModule in use (&43209) - An attempt was made to execute one of the
restricted commands or SWI's while the
module was locked (see Tracker_Lock)
Speed not implemented (&4320A) - Tracker_Speed was called with R0 outside
the range of values currently accepted.
Bad sample looping (&4320B) - Values of repeat offset/repeat length would
cause sample to loop outside its limit.
=============================================================================
This module was written for enthusiasts who wish to enjoy the benefits of the
Archimedes sound system in a multi-tasking environment.
Versions 0.00 to 1.xx of the original module were written by Hugo Fiennes
allowing the playing of any soundtracker tunes.
Versions 2.00 to 2.xx were written by Fabrice Mercier and Hugo,
playing any tracker tunes (with changes/improvements).
Versions 3.00 to 4.07 were written by Matthew Farrow to allow the playing of
soundtracker or tracker tunes, with the SWI extension
from versions 4.00 onwards.
You can contact Hugo in the following ways:
Voice: UK (0749) 72234 (ask for Hugo)
VodaFone: (0831) 444192
The World of Cryton (bbs) : UK (0749) 679794 (300-2400 - 1 line)
: UK (0749) 670030 (300-HST/V32 - 2 lines)
Mail: Prestel 045847608, CIX altman
Burcott Manor, Wells, Somerset, BA5 1NH, UK
Matt Farrow:
Mail: Arcade bbs [081-654 2212] as 'Matthew Farrow' (#483)
[081-655 4412]
45 Alleyn Park, Dulwich, London SE21 8AT
=============================================================================
Updates
-------
Version 4.00 (from 3.04)
- SWI interface added.
- Volume translations for soundtracker modules performed correctly now (?)
- Locking system introduced
- Next pattern line played just after pattern position incremented, not
just before (so the position doesn't appear to be ahead of the music).
- Removal of more minor bugs..
Version 4.01
- Doesn't slow everything down so much when paused
- Fixed bug in Tracker_PlayNote (concerning channel number)
- Corrected documentation on Tracker_ReadSampleTable
Version 4.02
- Added new SWI's 'Tracker_MuteChannel' and 'Tracker_RestoreChannel'
- Arpeggio command altered to conform with a soundtracker-derivative
format; I think it's the same as the soundtracker format proper, but
I can't find any documentation to check this!
- Fixed bug where if you did a Tracker_PlayNote while the tune was paused,
it sometimes didn't clear the sound buffers afterwards (buzzing etc.)
Version 4.03
- I have fixed the Tracker_PlayNote bug from V4.01 now, honest!
- Fixed problem introduced in V4.02 where doing Tracker_PlayNote while a
tune was playing sometimes crashed (if the sample was blank)
- Should crash less often when loading a new tune (no promises!)
Version 4.04
- Added *PlaySpeed and option to change sample rate (faster 8-channel
tunes)
- Provision for VIDC enhancer owners (tunes are normally a perfect fifth
too high) in the form of *PlaySpeed <2|3>
- Added Tracker_Speed SWI (same as *PlaySpeed)
- Module now claims memory in RMA and builds tables as it needs them,
saving about 12K of disc space.
- Altered *PlaySamples command to print '-' for sample name if blank (used
to ignore non-zero samples with blank names)
- Main interrupt put on TickerV, so this should end problems any multisync
monitor owners may have had with tunes going too fast etc.
Version 4.05
- Fixed Tracker_ReadSampleTable (when R0 was out of range [ie. >15/>31] R1
pointed to an undefined string) so that R1 and R6 will point to a
zero if the sample number is out of range.
- Changed command order so that '*Plays.' will do *PlayStatus rather than
*PlaySamples.
- Module now installs itself as a sound channel handler (no more of the
'TrackerVox' voice).
Effects of this recoding are:-
* It's much trickier for programs to sabotage any current tunes, as
assigning sound voices has no effect (unless the tune is stopped).
* Before, samples played simultaneously on different channels were
sometimes played slightly out of phase (sounded quieter/weird).
This sometimes still happens, but less often.
* Re-configuring the sample rate will not work while a tune is
playing, so that should be one less thing to go wrong.
- Slightly changed *Playsamples command to include sample number.
- Fixed problem with *Playstatus and non-terminated tune names.
- Altered Tracker_Stereo to return current settings if R0=-1 on entry.
- Added *PlayVolume/Tracker_Volume to control overall volume.
version (B)
- If *PlayStereo 4 was selected, stereo settings were being corrupted when
the tune was stopped.
- Tracker 'E' stereo commands caused a crash if *PlayStereo 4 was enabled.
Version 4.06 Major update
I finally got some decent amiga soundtracker documentation.
Then I discovered how much I had wrong.. major update needed!
- Soundtracker tunes were being converted wrongly..
* Repeat offset now made twice as big.
* Volumes above the specified maximum (64) were converted strangely.
Now out-of-range volumes are set to 64.
- Accuracy of the sound routines improved to cope with very small looping
samples which were seemingly pitched wrongly as a result of 4-byte
accuracy. Accuracy now 1 byte. This may slow things down a tiny bit.
- Altered the volume system so that soundtracker volumes are as accurate
as possible (ie. volume slides now slide down the soundtracker (0-64)
volumes rather than the arc log volumes (0-255), but still keeping
the same system for tracker tunes. Therefore, if you want the most
accurate playback of a soundtracker tune, ensure it is in its
original format.
- Finally implemented commands 3 (portamento) and 4 (vibrato). If you have
converted original soundtracker tunes into tracker format, command 4
will have no effect due to the different volume formats. The vibrato
effect may not be exactly the same as on the amiga, but it's close
enough.
- When soundtracker tunes are SWI 'MemoryLoad'ed, they are converted back
to the original format when *PlayStop etc. is performed (to allow
editors to save as soundtracker format). NB Tracker-specific commands
and out of range instruments etc. are ignored/mis-converted.
- Tracker_WriteSampleTable introduced to allow transparent access of the
sample data and independence (almost) of the Tracker format.
- ** Please Note ** Volumes returned by Tracker_ReadSampleTable while
soundtracker tunes are loaded are now in the range 0-64. These can
be converted into tracker volumes using the new
Tracker_TranslateVolume SWI. *PlaySamples converts the volumes first.
- SWI Tracker_UpdateData introduced to help editors interface with the
Trackermodule.
- Sample data information now read directly in the main routines rather
than copied when the module is loaded, to enable editors to alter the
module while playing.
- On reset, tune continues playing rather than being killed as before.
- When tune is stopped, the sound system is restored more effectively (ie.
resetting the sample rate with 8 voices active previously now works -
eg. when interrupting !Maestro).
Version 4.07
- Changed command 4 again.. it wasn't bugged, I just changed the specs.
It seems that some players disagree on what command 4 should be, and
I'm now implementing it as varying the pitch (as much over as below
the original pitch).
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*
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00001f90 41 6e 20 65 72 72 6f 72 20 77 69 6c 6c 20 62 65 |An error will be|
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*
00002580 2d 2d 2d 0a 54 72 61 63 6b 65 72 5f 50 6c 61 79 |---.Tracker_Play|
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*
000025f0 2d 2d 2d 2d 2d 0a 0a 4f 6e 20 45 6e 74 72 79 3a |-----..On Entry:|
00002600 20 20 2d 0a 0a 4f 6e 20 45 78 69 74 20 3a 20 20 | -..On Exit : |
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*
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*
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*
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00002950 6b 65 72 5f 50 61 75 73 65 20 20 20 20 20 20 20 |ker_Pause |
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*
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*
00002a50 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 6b |----------.Track|
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*
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00002b80 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
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00002f90 6f 66 20 72 61 6e 67 65 2e 0a 0a 0a 0a 2d 2d 2d |of range.....---|
00002fa0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00002fe0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 6b |----------.Track|
00002ff0 65 72 5f 53 65 74 50 6f 73 20 20 20 20 20 20 20 |er_SetPos |
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00003010 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003050 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 4f 6e |------------..On|
00003060 20 45 6e 74 72 79 3a 20 20 52 30 20 3d 20 4e 65 | Entry: R0 = Ne|
00003070 77 20 73 65 71 75 65 6e 63 65 20 70 6f 73 69 74 |w sequence posit|
00003080 69 6f 6e 20 28 30 2d 31 32 37 20 6d 61 78 29 0a |ion (0-127 max).|
00003090 20 20 20 20 20 20 20 20 20 20 20 52 31 20 3d 20 | R1 = |
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000031f0 65 6e 65 72 61 74 65 64 2e 0a 0a 0a 0a 0a 0a 2d |enerated.......-|
00003200 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003240 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 |------------.Tra|
00003250 63 6b 65 72 5f 52 65 61 64 50 6f 73 20 20 20 20 |cker_ReadPos |
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00003280 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
000032b0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a |--------------..|
000032c0 4f 6e 20 45 6e 74 72 79 3a 20 20 2d 0a 0a 4f 6e |On Entry: -..On|
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00003340 61 78 29 0a 20 20 20 20 20 20 20 20 20 20 20 52 |ax). R|
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00003450 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003490 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 |-----------.Trac|
000034a0 6b 65 72 5f 50 6c 61 79 4e 6f 74 65 20 20 20 20 |ker_PlayNote |
000034b0 20 20 20 28 53 57 49 20 26 34 33 32 30 39 29 0a | (SWI &43209).|
000034c0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003500 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 4f |-------------..O|
00003510 6e 20 45 6e 74 72 79 3a 20 20 52 30 20 3d 20 53 |n Entry: R0 = S|
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00003540 2d 38 20 6d 61 78 29 0a 20 20 20 20 20 20 20 20 |-8 max). |
00003550 20 20 20 52 31 20 3d 20 54 72 61 63 6b 65 72 20 | R1 = Tracker |
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00003580 20 20 20 20 20 52 32 20 3d 20 53 61 6d 70 6c 65 | R2 = Sample|
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000035a0 20 20 20 20 20 20 20 20 20 20 20 52 33 20 3d 20 | R3 = |
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000035f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00003620 20 20 20 20 20 20 20 20 20 20 20 20 6c 6f 61 64 | load|
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00003850 66 6f 20 53 57 49 20 74 6f 20 66 69 6e 64 20 6f |fo SWI to find o|
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000038b0 6d 65 2e 0a 4e 42 20 54 68 69 73 20 63 61 6c 6c |me..NB This call|
000038c0 20 73 68 6f 75 6c 64 20 62 65 20 61 76 6f 69 64 | should be avoid|
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000038e0 75 6e 6c 65 73 73 20 74 68 65 20 70 75 72 70 6f |unless the purpo|
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00003900 20 65 61 63 68 20 73 61 6d 70 6c 65 20 73 65 70 | each sample sep|
00003910 65 72 61 74 65 6c 79 2e 0a 0a 0a 0a 0a 0a 2d 2d |erately.......--|
00003920 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003960 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 |-----------.Trac|
00003970 6b 65 72 5f 54 75 6e 65 49 6e 66 6f 20 20 20 20 |ker_TuneInfo |
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00003990 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
000039d0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 4f |-------------..O|
000039e0 6e 20 45 6e 74 72 79 3a 20 20 2d 0a 0a 4f 6e 20 |n Entry: -..On |
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00003a00 75 65 6e 63 65 20 74 61 62 6c 65 20 6c 65 6e 67 |uence table leng|
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00003a50 3d 20 43 75 72 72 65 6e 74 20 73 70 65 65 64 20 |= Current speed |
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00003b40 63 61 62 6c 65 29 0a 20 20 20 20 20 20 20 20 20 |cable). |
00003b50 20 20 52 35 20 3d 20 41 64 64 72 65 73 73 20 6f | R5 = Address o|
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00003b80 20 20 20 20 20 20 20 20 20 20 0a 20 20 20 20 20 | . |
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00003bb0 20 43 20 66 6c 61 67 20 69 73 20 73 65 74 2c 20 | C flag is set, |
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00003bd0 66 6c 61 67 20 69 73 0a 20 20 20 20 20 20 20 20 |flag is. |
00003be0 20 20 20 63 6c 65 61 72 65 64 2e 0a 0a 20 20 20 | cleared... |
00003bf0 20 20 20 20 20 20 20 20 49 66 20 74 68 65 72 65 | If there|
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00003c30 20 61 72 65 0a 20 20 20 20 20 20 20 20 20 20 20 | are. |
00003c40 70 72 65 73 65 72 76 65 64 2e 0a 20 20 20 20 20 |preserved.. |
00003c50 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00003c80 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0a 0a | ..|
00003c90 54 68 69 73 20 63 61 6c 6c 20 70 72 6f 76 69 64 |This call provid|
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00003d30 69 6e 20 52 35 29 2c 20 62 65 63 61 75 73 65 20 |in R5), because |
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00003d50 69 73 20 61 76 61 69 6c 61 62 6c 65 20 76 69 61 |is available via|
00003d60 20 74 68 65 20 76 61 72 69 6f 75 73 20 53 57 49 | the various SWI|
00003d70 27 73 2c 0a 61 6e 64 20 73 6f 75 6e 64 74 72 61 |'s,.and soundtra|
00003d80 63 6b 65 72 20 66 6f 72 6d 61 74 20 6d 6f 64 75 |cker format modu|
00003d90 6c 65 73 20 77 69 6c 6c 20 68 61 76 65 20 62 65 |les will have be|
00003da0 65 6e 20 63 6f 6e 76 65 72 74 65 64 20 70 61 72 |en converted par|
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00003dd0 61 64 65 64 20 28 61 6e 64 20 74 68 65 72 65 66 |aded (and theref|
00003de0 6f 72 65 20 69 6e 20 61 6e 20 75 6e 6b 6e 6f 77 |ore in an unknow|
00003df0 6e 20 66 6f 72 6d 61 74 29 2e 20 54 68 69 73 20 |n format). This |
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00003e10 72 6f 76 69 64 65 64 20 69 66 2c 20 66 6f 72 20 |rovided if, for |
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00003e40 64 69 74 6f 72 73 20 6e 65 65 64 20 74 6f 20 6b |ditors need to k|
00003e50 6e 6f 77 20 69 66 20 74 68 65 0a 74 75 6e 65 20 |now if the.tune |
00003e60 63 75 72 72 65 6e 74 6c 79 20 70 6c 61 79 69 6e |currently playin|
00003e70 67 20 69 73 20 72 75 6e 6e 69 6e 67 20 66 72 6f |g is running fro|
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00003e90 6f 72 20 74 68 65 20 70 6c 61 79 65 72 27 73 2f |or the player's/|
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00003eb0 6b 73 70 61 63 65 2e 0a 0a 0a 20 20 20 20 20 20 |kspace.... |
00003ec0 20 20 20 20 20 20 20 20 20 20 20 20 20 0a 0a 0a | ...|
00003ed0 0a 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |.---------------|
00003ee0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003f10 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 |--------------.T|
00003f20 72 61 63 6b 65 72 5f 53 6f 75 6e 64 49 6e 66 6f |racker_SoundInfo|
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00003f40 42 29 0a 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |B).-------------|
00003f50 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00003f90 0a 0a 4f 6e 20 45 6e 74 72 79 3a 20 20 52 30 20 |..On Entry: R0 |
00003fa0 3d 20 50 6f 69 6e 74 65 72 20 74 6f 20 77 6f 72 |= Pointer to wor|
00003fb0 64 2d 61 6c 69 67 6e 65 64 20 32 35 36 20 62 79 |d-aligned 256 by|
00003fc0 74 65 20 62 6c 6f 63 6b 20 74 6f 20 68 6f 6c 64 |te block to hold|
00003fd0 20 73 6f 75 6e 64 20 64 61 74 61 0a 0a 4f 6e 20 | sound data..On |
00003fe0 45 78 69 74 20 3a 20 20 52 30 20 70 72 65 73 65 |Exit : R0 prese|
00003ff0 72 76 65 64 0a 20 20 20 20 20 20 20 20 20 20 20 |rved. |
00004000 20 20 20 0a 20 20 20 20 20 20 20 20 20 20 20 69 | . i|
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00004030 20 77 69 6c 6c 20 62 65 20 73 65 74 2c 20 6f 74 | will be set, ot|
00004040 68 65 72 77 69 73 65 20 74 68 65 20 43 0a 20 20 |herwise the C. |
00004050 20 20 20 20 20 20 20 20 20 66 6c 61 67 20 77 69 | flag wi|
00004060 6c 6c 20 62 65 20 63 6c 65 61 72 65 64 2e 0a 0a |ll be cleared...|
00004070 49 66 20 74 68 65 72 65 20 69 73 20 6e 6f 20 74 |If there is no t|
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00004090 72 6f 72 20 77 69 6c 6c 20 62 65 20 67 65 6e 65 |ror will be gene|
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000040c0 65 64 20 66 6f 72 20 61 64 76 61 6e 63 65 64 20 |ed for advanced |
000040d0 75 73 65 73 20 6f 66 20 74 68 65 20 74 72 61 63 |uses of the trac|
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00004110 74 65 63 68 6e 69 63 61 6c 20 6e 61 74 75 72 65 |technical nature|
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*
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00005560 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
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000055d0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
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00005c60 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00005ca0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 |-----------.Trac|
00005cb0 6b 65 72 5f 55 6e 6c 6f 63 6b 20 20 20 20 20 20 |ker_Unlock |
00005cc0 20 20 20 20 20 20 28 53 57 49 20 26 34 33 32 30 | (SWI &4320|
00005cd0 45 29 0a 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |E).-------------|
00005ce0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
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00005e50 74 65 64 2e 0a 0a 0a 0a 0a 2d 2d 2d 2d 2d 2d 2d |ted......-------|
00005e60 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00005ea0 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 6b 65 72 5f 4d |------.Tracker_M|
00005eb0 75 74 65 43 68 61 6e 6e 65 6c 20 20 20 20 20 20 |uteChannel |
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*
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00005f20 45 6e 74 72 79 3a 20 20 52 30 20 3d 20 63 68 61 |Entry: R0 = cha|
00005f30 6e 6e 65 6c 20 74 6f 20 6d 75 74 65 20 28 31 2d |nnel to mute (1-|
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00006030 72 20 69 73 20 68 69 67 68 65 72 20 74 68 61 6e |r is higher than|
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*
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000060c0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00006100 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 6b 65 72 |--------.Tracker|
00006110 5f 52 65 73 74 6f 72 65 43 68 61 6e 6e 65 6c 20 |_RestoreChannel |
00006120 20 20 20 28 53 57 49 20 26 34 33 32 31 30 29 0a | (SWI &43210).|
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*
00006170 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 4f |-------------..O|
00006180 6e 20 45 6e 74 72 79 3a 20 20 52 30 20 3d 20 63 |n Entry: R0 = c|
00006190 68 61 6e 6e 65 6c 20 74 6f 20 74 75 72 6e 20 6f |hannel to turn o|
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00006200 72 6e 0a 74 68 65 20 73 65 6c 65 63 74 65 64 20 |rn.the selected |
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00006220 0a 20 4e 6f 20 65 72 72 6f 72 20 69 73 20 67 65 |. No error is ge|
00006230 6e 65 72 61 74 65 64 20 69 66 20 74 68 65 20 63 |nerated if the c|
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00006250 20 68 69 67 68 65 72 20 74 68 61 6e 20 74 68 65 | higher than the|
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00006290 72 61 63 6b 65 72 6d 6f 64 75 6c 65 2e 0a 20 20 |rackermodule.. |
000062a0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
000062b0 20 20 20 20 20 20 20 20 20 0a 0a 0a 2d 2d 2d 2d | ...----|
000062c0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00006300 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 72 61 63 6b 65 |---------.Tracke|
00006310 72 5f 53 70 65 65 64 20 20 20 20 20 20 20 20 20 |r_Speed |
00006320 20 20 20 20 28 53 57 49 20 26 34 33 32 31 31 29 | (SWI &43211)|
00006330 0a 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |.---------------|
00006340 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00006370 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a |--------------..|
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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0000a640 61 72 79 69 6e 67 20 74 68 65 20 70 69 74 63 68 |arying the pitch|
0000a650 20 28 61 73 20 6d 75 63 68 20 6f 76 65 72 20 61 | (as much over a|
0000a660 73 20 62 65 6c 6f 77 0a 20 20 20 20 20 20 20 20 |s below. |
0000a670 74 68 65 20 6f 72 69 67 69 6e 61 6c 20 70 69 74 |the original pit|
0000a680 63 68 29 2e 0a |ch)..|
0000a685 
.