Dsp
From Hackepedia
Sometimes you will have two applications trying to access your audio device. Here is an example screenshot of a user trying to run xmms, when something else is accessing the audio:
The culprit can be discovered with lsof assuming your audio device is /dev/dsp like it is on BSD:
$ lsof | grep dsp firefox-b 14905 frank 1w VCHR 30,3 0t0 38 /dev/dsp0.0 firefox-b 14905 frank 1w VCHR 30,3 0t0 38 /dev/dsp0.0 firefox-b 14905 frank 1w VCHR 30,3 0t0 38 /dev/dsp0.0 firefox-b 14905 frank 1w VCHR 30,3 0t0 38 /dev/dsp0.0
as you can see, one of the websites I am viewing with firefox has claimed access to my dsp first. I must now close that tab in firefox, and restart xmms, and all is well.
