I have a related problem.  I have an SB Live, which supports 4 channel
output.

Pulseaudio chooses the output device "ALSA PCM on front:0 (ADC
Capture/Standard PCM Playback) via DMA"

The "front:0" means that it will only play only on the front pair of
speakers.  If it used "default:0", it would play on all four.  I've had
to change all of my common apps to use ALSA output instead, which works
around the problem.

I've installed all the pulseaudio configuration tools from the
repositories, but none give me the option to change this.  I edited
~/.pulse/default.pa, and restarted, but nothing seems to have changed.

I tried to run `pulseaudio -C`, to do "list-sinks", but it spits me back
to the shell.

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The user cannot select sound card
https://bugs.launchpad.net/bugs/229137
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