If you connect USB headphones, they should become the primary sound
output, which is the device that the sound menu controls.
https://wiki.ubuntu.com/Sound#primary-output If that is not happening,
please report a bug on the pulseaudio package.
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What is the official workaround for people who have multiple sound
devices? There must be a lot of people in this situation (i.e. everyone
with USB headphones).
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Bugs, which is subscribed to Ubuntu.
The sound menu is controlling the sound of the default device by design.
There are no plans to support to control the volume of other devices.
** Changed in: indicator-sound (Ubuntu)
Status: New = Won't Fix
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Bugs,