For the MJJ megademo entry I prepared a special SID Sound Designer driver. It operates using a single SID voice on Timer A and has the fastest SID interrupt I can think of at the moment.

Because of Tobe/MJJ's good optimising, it was not needed. Maybe you can use it in one of your prods?

k0d: Usual SSD driver suspects + gwEm
msx: Floopy/MJJ