You have to make QEMU use ALSA as your sound system and specify a mixer
device for input and output. This can be done using some environment
variables that should be set before the qemu binary is run.

The following may work:

export QEMU_AUDIO_DRV=alsa         # the default is OSS if I recall
correctly
export QEMU_ASLA_DAC_DEV=dmix    # for playback mixing
export QEMU_ALSA_ADC_DEV=dsnoop  # for record mixing

Of course you have to install and configure dmix and dsnoop in your alsa
sub-system. Dmix/sdnoop may or may not be installed and configured by
your distribution. Take a look at /usr/share/alsa/alsa.conf (may be in
other location in your system).

I hope this somehow helps,

Shahar

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