GNU/Linux Desktop Survival Guide by Graham Williams
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Duplex Mixing

Duplex mixing will allow multiple sounds to be sent to the audio card at a time. Copy /usr/share/doc/libasound2/examples/asound.conf_dmix to /etc/asound and restart alsa:

  $ wajig restart alsa

Then multiple command line mplayers can all play at the same time. Be sure to configure xmms and beep-media-player to use the ALSA output device.

When running quodlibet there is crackling in the audio, which is not there when the dmix is removed! Running mplayer and beep-media-player are just fine.

Further details on setting up dmix is available from http://alsa.opensrc.org/index.php?page=DmixPlugin.