I don't anything about motherboards in PCs, so can't say
if this is possible. What I means is, you may not need
a mic hooked up for folks to listen in.
Speakers can be used as a mic. Knowing the principal behind this, we were laying the vocals over a tune we cut in a hotel room one night and didn't have a mic. I jacked the headphones
into the mic port, did a testing 123, and we laid the vocals
down using headphones as a mic. It worked flawlessly.