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by dsr_ 5032 days ago
Let's take a common case: I have a motherboard sound device which I use 95% of the time, and I have a USB camera that has a built-in microphone.

When I go to settings in Google Hangout, it asks me which device I want to use. ALSA presents the interfaces. I choose whatever combination I want -- mic from the camera, headphone out through the mobo -- and it works.