--- Comment #3 from Tanu Kaskinen <ta...@iki.fi> ---
The USB device don't seem to have any playback volume controls. It only has two
switches, "Extension Unit" and "Loudness", and the loudness switch is already
on, so I'd guess PulseAudio can't really do anything about the low volume.
You can anyway try with "alsamixer -c1" what those two switches do. In case
you're not familiar with alsamixer, here are the important keys: left and right
arrows move between elements, and the 'm' key toggles the selected switch on
and off. Esc exits alsamixer.
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