I've just started using Groove Mechanic. It works pretty well, but there are
a couple of things I can't figure out.

First, how do I set the recording parameters? They default to CD values,
which is fine for now, but I foresee having to use other values eventually.

Second, how can I make it play the line-in signal through my computer's
headphones? It plays back the recorded file when asked, but when I'm
recording -- silence. I have to keep a second set of headphones plugged into
my amplifier and constantly switch back and forth. Very inconvenient.