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 volume to rise and fall in a warbling effect. The first digit gives the speed of the volume change (1=slow, &F=fast), and the second digit gives the magnitude of the vibrato. The vibrato is created by subtracting a sinusoidally varying amount from the volume of the channel.
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) Position jump -
J (Tracker) When this command is met, jump to position <parameter> in song.
B (Tracker) Break pattern -
Equivalent to amiga command D
C (amiga) Set volume -
V (Tracker) Alters the current volume of the channel to the value specified (0-64 amiga, 0-255 arc). Volume 0 means mute sound.
D (amiga) Break pattern -
B (Tracker) 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) Set speed -
S (Tracker) Sets the speed (number of vsyncs between events) to parameter.
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