How do I set the default device?
Create a configuration file (either for the whole system at /etc/asound.conf or .asoundrc in your home directory) containing statements like the following ones:
defaults.ctl.card 1
defaults.pcm.card 1
defaults.timer.card 1
This file would make card 1 the default. The card number (1 in this example) is taken from the /proc/asound/cards file.
NOTE: use the number given by alsamixer - F6/S for a default snd device.
cause: usb cam/microphone was added to pc which messed up the sound device order.
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