The playback drivers are nicely functional, but there's a problem on certain set-ups (particularly really fast ones) that causes instability, and it's that that's holding things up.
Making it work well on a 7MHz 68000 and a fast 68060 is a challenge, especially when we're using Zorro II and clockport as an interface.
It's incredibly frustrating to see it work perfectly on one machine and not on another, and these are the bugs that take the time.
There will be more updates soon.
Don't worry too much about Paula sounding old. Most spot effects will be fine with 8-bit, especially any explosions, whacks, thuds, or squids hitting windscreens. It'll basically make things sound like CD32 games which used CD Audio (c.f. Jetstrike, which is awesome).