the ac97 of virtualbox does not has any subwoofer and the output volume
is only affected by master and pcm plack volume in the virtualbox
implementation.
the output is silent if pulseaudio try to change pcm playback volume or
master playback volume to step 0
ports:
analog-output-lfe-on-mono;output-amplifier-on: Analog Output
(LFE) / Amplifier (priority 4010, available: unknown)
analog-output-lfe-on-mono;output-amplifier-off: Analog Output
(LFE) / No Amplifier (priority 4000, available: unknown)
active port: <analog-output -lfe-on-mono;output-amplifier-on>
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https://bugs.launchpad.net/bugs/905587
Title:
[ICH - Intel 82801AA-ICH, playback] No sound at all
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