It appears that when I have a headphone plugged in, the speakers are
automatically disabled and the output sound is sent to the headphone.
However, I want to explicitly control (e.g. via a script or commandline
- not a GUI) whether the sound from an (arbitrary) application is going
to the speakers or to the headphone even when the headphone is plugged in.
(When I say "arbitrary application" that means I can't alter the code of
the application itself).
Is this possible?
(I have heard that ALSA mutes the speakers when it detects plugged-in
headphones. Is switching between them as simple as using e.g. amixer(1)
to unmute the speakers and mute the headphones and vice versa, or is
there more to it.)
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