Fixed my ubuntu sound problems

I have been enjoying my recent upgrade to Ubuntu 9.04. Suddenly started having sound problems, however — no idea how/when/why this started happening.

But the symptom is that all sound stops, and I just hear static when sound is supposed to be playing. Well I finally found the answer: turn up the volume. Seems the PCM device gets muted somehow, and ALSA produces static instead of nothing in that case. Go figure. Turning the volume up for PCM in the ALSA mixer gets things back to normal.