N-SPC Engine/Nintendo/Koji Kondo/SFX Sequence Format
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The SFX sequence data is slightly modified compared to the standard N-SPC's voice command format. These are headerless, unlike a song, and they only support one channel at a time, with the channel used being fixed. Both games have almost the same command set except for VCMD $FF.
All SFX are initially handled at a tempo of $38.
| VCMD ID | Description | Arguments |
|---|---|---|
| $00 | End of SFX | |
| $01-$7F | Note Duration | xx |
| $80-$C5 | Note | |
| $C6-$CF | Tie | |
| $D0-$D9 | Percussion | |
| $DA | Instrument | xx |
| $DB-$DC | Invalid Note | |
| $DD | Pitch Slide to Note | xx yy zz aa |
| $DE-$EA | Invalid Note | |
| $EB | Note Pitch Envelope To | xx yy zz |
| $EC-$FE | Invalid Note | |
| $FF | Restart SFX (Super Mario World CPUIO0) | |
| $FF | Jump Back One Byte (Super Mario World CPUIO3) | |
| $FF | Jump to SFX ID (Pilotwings) | xx |
SFX Instrument Format
The SFX instrument format, shared among all SFX but not consistently stored in terms of memory location, consists of a series of bytes corresponding to direct DSP register writes to the following in order (with the last one not being a DSP register write at all)...
- VxVOLL
- VxVOLR
- VxPITCHL
- VxPITCHH
- VxSRCN
- VxADSR1
- VxADSR2
- VxGAIN
- Pitch Base Multiplier
SFX Percussion Format
This is identical to the music percussion format.
SFX Voice Command Format
TODO VCMD documentation (some of them are identical to standard N-SPC)