Hi, Does anybody know the maths ( or where I can find it ) behind layering audio files on top of each other? Cos I have this idea: In cutting up drum loops or beats extracted from a song, say to take out a snare drum or kick etc but most of the time it will have a hi-hat or something on top of it. I guess I'd be simplifying it by saying that: x=hi hat y=kick x*y=kick and hi hat? But if there exists an inverse to y then you could remove the hi hat if you had the hi hat seperately which is easy to get. (can be extracted from other part of loop pretty easy). I know that in acoustic drum loop the hi hat hits won't be identical but similar enough to use in that equation? So thats my theory. I know the maths will be a lot harder than the simple algebra above but can it be done? Are there any simpler existing methodologies for cutting up drum beats for the single shot samples? Also I'd like to introduce myself, my names Adam and Im doing a BE in Software at melbourne uni australia and I'm heavy into PC music ( mostly funk, trip hop, breaks and stuff ) and I'm looking for a BBS filled with some Pro Audio/PC Heavyweights to talk about something a bit more stimulating than what MIDI means. Hopefully I can bring something to the board. Peace.