I spent a couple of hours with a dual 2 GHz G5 last night.
Wow, what a nice machine! I gotta get me one of those.
I tried to debug PortAudio / Audacity, but unfortunately I
didn't solve the problem. I definitely narrowed it down:
the problem is that the sound output can be configured in
"digital" mode, which PortAudio doesn't currently support.
Unfortunately the command to switch back to normal linear
PCM mode doesn't work, nor does the command to create a
converter from linear PCM samples to digital samples.
Running iTunes switches the driver into linear PCM mode,
so clearly it's possible. In fact, if you start Audacity
and THEN launch iTunes, Audacity works great.
I'll keep working on it. I might get another chance
I'll also take a look at the ModifyState problem in a
day or two, plus a couple of other small bugs that have
been reported recently.