The SAMSON CO1U microphone uses a stereo chip where the left channel should be the final output. However, on linux, we see the post-proc(left) and raw(right) signals separately. To fix this, we can map the left channel to both channels reducing to a proper mono channel. (Compare to setting a mono signal on
pavucontrol which gives a screwed up noisy signal).
Add the following line to
# SAMSON CO1U HACK load-module module-remap-source source_name=samson-co1u-hack master=alsa_input.usb-Samson_Technologies_Samson_C01U-00.analog-stereo master_channel_map=left,left channel_map=left,right remix=false
There is a chance your mic name is different than mine. You can confirm with
pacmd list-sources | grep 'Samson' | grep 'name' and use the correct name for the master.