So, lately I've taken an interest in mixing/mashing music, but the way I currently do it is no fun at all and allows for no dynamic changes (since I pre-mix songs and tinker around in Audacity). Does anybody know of a program that I could mix music, export what I mix to MP3, and also have DJ buttons (e.g. overlay a song onto another, scratch a turntable, etc.)? I've used TRAKTOR before and I kind of liked it, but it's not exactly what I'm looking for. Freeware would be much preferred, but I'm probably shooting for the stars there.