Originally Posted by R. Belmont
(although each with their own ARM7 so a single 128-voice sequence isn't happening).

I doubt any sane composer would attempt 128-voice music in an arcade game anyway, but I don't see why it would be so impossible to do it with two ARM7s driving 64 voices apiece. As long as one of the SH-4s issues a sound command to both ARM7s at relatively the same time, they should end up playing in sync with no noticeable lag.