I have a mixer going into the Line input of my M-Audio FastTrack USB. The levels are all way too low, and the recorded signals are only on the right side. I've fiddled the Line/Instrument switch, the Stereo/Mono switch, and all the knobs and controls in the software. Nothing's helping. All of my drivers are up to date. I can't work like this, so any help'd be great, thanks.