sound engine formats

Pently:
%pppppddd | p = pitch (two octaves available at once), d = duration (index into 1, 2, 3, 4, 6, 8, 12, 16)
pitch 25  | tie (add this note's duration to previous note's duration)
pitch 26  | rest
$D8 xx    | instrument change
$D9 xx    | arpeggio
$DA       | legato off
$DB       | legato on
$DC xx    | is transpose (changes what note the pitch values start at)
$DD xx    | grace note
$DE-FE    | unused
$FF       | ends of pattern

ggsound:
0-86      | note
87-102    | set note duration (0-15)
103       | set length low byte
104       | set length high byte
105       | set volume envelope
106       | set pitch envelope
107       | set duty envelope
108       | goto
109       | call
110       | return
111       | stop
112       | set arpeggio envelope

Famitone:
%00nnnnnn | note (0..59 are octaves 1-5, 63 note stop)
%01iiiii0 | instrument change (0 is default, silence)
%10rrrrrr | number of empty rows (up to 63)
%11eeeeee | special tag or effect
   eeeeee | $01..19 speed
%11111110 | end of the stream, two next bytes are new pointer
%11111111 | reference (next two bytes of absolute address, and number of rows)

Nintendo's N-SPC
$00        | End/return
$01-$7F    | Note parameters (duration and velocity)
$80-$C7    | Note
$C8        | Tie
$C9        | Rest
$CA DF     | Percussion Note
$E0 xx     | Set Instrument
$E1 xx     | Pan
$E2 xxyy   | Pan Fade
$E3 xxyyzz | Vibrato On
$E4        | Vibrato Off
$E5 xx     | Master Volume
$E6 xxyy   | Master Volume Fade
$E7 xx     | Tempo
$E8 xxyy   | Tempo Fade
$E9 xx     | Global Transpose
$EA xx     | Per-Voice Transpose
$EB xxyyzz | Tremolo On
$EC        | Tremolo Off
$ED xx     | Volume
$EE xxyy   | Volume Fade
$EF xxyyzz | Call Subroutine
$F0 xx     | Vibrato Fade
$F1 xxyyzz | Pitch Envelope To
$F2 xxyyzz | Pitch Envelope From
$F3        | Pitch Envelope Off
$F4 xx     | Tuning
$F5 xxyyzz | Echo VBits / Volume
$F6        | Echo Off
$F7 xxyyzz | Echo Parameters
$F8 xxyyzz | Echo Volume Fade
$F9 xxyyzz | Pitch Slide
$FA xx     | Percussion Patch Base
$FB-FF     | Unused