I think you guys are just suffering from latency spikes.
Three suggestions:

A) user a bigger buffer (check manual for your app
to see if it can do this).

B) Run the task with higher than normal priority.
e.g.:
$ sudo nice -10 mpg123 blah.mp3 

C) Use a low-latency kernel and a 
properly-designed application which can take
advantage of SCHED_FIFO (requires root privileges).

More info:
http://www.linuxdj.com/audio/quality/#dropouts
Also read the section after that about latency.
Video-related problems may be due to the video card
playing unfairly with the PCI bus. (I'm told this
doesn't apply to AGP cards.)
http://www.linuxdj.com/audio/quality/#videocards 

All that said, I have an Envy24-based card (M-audio Delta 66)
and I don't get dropouts from it with simple jobs like mp3 playback
on my PIII-866 box.

Couldn't get it to work with Return to Castle Wolfenstein, though.
Maybe the Delta just doesn't look enough like a Soundblaster. :)
For that (and CD playback) I'm using an old turtle beach ISA card,
which works fine.

BTW, I had to spend quite some time tuning the graphics settings
on RTCW. Sound playback was very glitchy until I did this,
now it's rock solid. I expect it's because I was overloading my
CPU.

--PW

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