so basically ive jus bought a new soundcard for my pc so i can record/edit my mixes.. all plugged in fine with a phono to jack lead from mixer 2 computer, and the soundcard is in ok.. but when i record any audio its soooo quiet and really fussy with a humming noise????? could this be my phono to jack cable??? id b grateful for any help am going mad !!!!! Cheers!!!!!!!