command name	command	parameters
Mixer parameter change (SPC)	88h	[Switch mixer parameters] P1 effect output channel (0-17) P2 bit7-5 effect output level 8 steps (0-7) bit4-0 effect output PAN 32 steps (0- 31)
Hard check (---)	89h	[Hard check] P1 check item 00h: DRAM 4Mbit read / write 01h: DRAM 8Mbit read / write 02h: SCSP MIDI 03h: Sound source output (L / R) 04h: Sound source output (L) 05h: Sound source output (R)
PCM parameter change (-P-)	8Ah	[Parameter change for PCM stream playback] P1 PCM stream playback number (0-7) P2 bit7-5 Direct sound output level 8 steps (0-7) bit4-0 Direct sound Output PAN 32 steps (0-31) P3-P4 pitch word (0000h-FFFFh) P5 bit7-3 Effect input channel (0-15) [P5 = Rch] bit2-0 Effect input Level 8 levels (0-7) P6 bit7-3 Effect input channel (0-15) [P6 = Lch] bit2-0 Effect input level 8 levels (0-7) P7 Total level 256 levels (max: 00h-FFh: min)