GNU/Linux Desktop Survival Guide
by Graham Williams
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
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.