how to make USB microphone the default

[stan]

On Tue, 30 Aug 2011 11:58:27 -0500
Ranjan Maitra <maitra at iastate.edu> wrote:

> Does anyone know how to make a USB microphone the default? I have been
> trying out recordmydesktop with a USB microphone in, but the sound
> does not seem to be recording. Without the microphone, the recording
> happens, but understandably feebly and with lots of noise.
> 
> I am using F15 with the LXDE spin.

You can use alsa to do this, but it is complicated, and it has been
such a long time that I can't remember the details.  Better to use
Pulseaudio.  Install pavucontrol and set it in the last tab.