This is because of race condition between both cores, I think I fixed that yesterday.3. Don't know why, but music sometime stops and then starts after a while.
Oh and the "past" stages don't use cdda for music, they use PCM sound source, which is not emulated yet, so no music there.
As for other Sonic CD "bugs", looks like it can be normal behavior, would be helpful if you re-checked that on Gens or Fusion (brm saves should be compatible with them).
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