I'm not very technical and there's probably something blatantly obvious about what's wrong. I know just about the basics of this system so forgive me if I come across as a muppet. When I try to record an audio track I get horrific buzzing and crackling through my monitors/headphones. All works fine until the red light goes on and then it starts. Audio instruments work absolutely fine and midi devices do too until the moment I try to put something to an audio track. If I play a guitar, it's clear as a bell but when I go to record I get the buzzing from hell! If I open a new song, the buzzing happens and on certain other songs, where once I had no problem, it buzzes on audio. Certain other 'old' saves, it doesn't buzz on audio at all!! Where the hell do I start with this?? I've checked/changed if necessary all the wiring and it's not that. Any help at all would be greatly received, it really is doing my head in. Thank you in advance.