how many has had this problem. my pre production studio that consists of 2 sound modules EMU, a keystation, roland monitors and a pc..gives this air type hiss off. I've tried everything, even over the phone with the soundcard manufacturer. I've unhooked all my equipnemnt and still get the air so its not the equipment. could it be a software program or something cause I can't think of what else to try. can anyone help me out?