I'm attempting to record a set from my turntables to my iMac. not working so well yet... heres what im doing right now: turntables->mixer->amp->digital line in->roxio toast 8(spin doctor) I'm not getting any line in reading on the db meter at all. tried multiple cords, and checked all my grounds. is this a settings problem i have to change on the mac or am i overlooking something in my hardware setup? help please!