It seems MSB of 127, 126, 120 have been used for Yamaha/XG drum kits.
For PSR-2000 keyboard, [MSB,LSB,Prog] for MSB 126:
[127,0,xx] Various drum kits
[126,0,0] SFX Kit1
[126,0,1] SFX Kit2
[126,0,35] Arabic Kit
For PSR-S900 (similarly in Tyros-2, Tyros-3):
[127,0,xx] Various drum kits
[126,0,0] SFX Kit1
[126,0,1] SFX Kit2
[126,0,35] Arabic Kit
[126,0,40] Cuban Kit
[126,0,43] PopLatin Kit
[120,0,0] Standard Set
[120,0,8] Room Set
[120,0,16] Power Set
[120,0,24] Electronic Set
[120,0,25] Analog Set
[120,0,32] Jazz Set
[120,0,40] Brush Set
[120,0,48] Orchestra Set
[120,0,56] SFX Set
From the drum key/sound mapping list, it seems that, for MSB=127:
[127,0,0] Has full set of drum sounds
[127,0,xx] Has sparse set (some note/key has no sound), so it would fall
back to the sound from the full [127,0,0].
Similar mapping scheme for MSB=126, as well as MSB=120:
[126,0,0] Has full set of drum sounds
[126,0,xx] Has sparse set
[120,0,0] Has full set of drum sounds
[120,0,xx] Has sparse set
Seems like a "fall-back" sound lookup scheme, similar to the non-drum voices.
So if key/sound for MSB=120 could be found with:
[120,0,xx] if not found, try:
[120,0,0] if not found, try:
[127,0,0] always there, this is also GM-drumkit.
Like-wise, with MSB=126 drum sound:
[126,0,xx] if not found, try:
[126,0,0] if not found, try:
[127,0,0] always there, this is also GM-drumkit.
PDF manuals for the keyboards are available online if folks want to take a
closer look.
Jimmy
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