Basically, I want to purchase a Kaoss Pad in order to A. Sample music (also mashing and whatnot) B. Get some ideas for my own music and C. Use it for some guitar effects (I am aware it is not that great with guitar) but I want to be able to freely use it for reason A.

Is there software that can separate individual tracks (or instruments) from an mp3/m4a/wma file that is available at a low cost?