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)