Im trying to connect a record turntable (AT-PL50) to my HP PC computer, Windows XP. I can get a signal using the microphone jack and record satisfactorily through the Cakewalk software but, of course, only in mono.) I can't get a signal using the stereo inputs. I've been into Control Panel, selected various inputs, used volume sliders, set the turntable to pre-amp on and off. Any ideas would be gratefully received!