I'm intrigued why ST sound emulation would need more than a 68000, can you grab the mixer register & tone/noise frequencies and do a direct conversion with chip waves? At least that's how I'm wrapping around the AY to play them on c64. (with a table to grab the buzzer sync frequencies if they're needed, most early games didn't) In my experience the timing/envelope stuff wasn't used very much in favour of the volume registers, so I left all that out which made it a lot easier to get working.
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