Okay, this is not strictly “Breaking Systems”, but it is useful. If you are lucky like me, you own a Samson C01U USB mic. Great little mic. Unfortunately, it maps its mono output two two channels, showing up like a stereo mic in Linux. The right channel is the (weak) signal that comes out of the pre-amp, and the right signal is the amplified signal. (Do not forget to adjust those two channels separately in your mixer for best results)
The easy fix? Use a custom pulseaudio source to remap only the left channel to a new input source.
Add the following line to
load-module module-remap-source source_name=GoodMic master=alsa_input.usb-Samson_Technologies_Samson_C01U-00-C01U.analog-stereo channels=1 master_channel_map=left channel_map=left remix=false
Then restart your pulseaudio daemon (
pulseadio --kill; pulseaudio --start)