The cheapest way is just use real tracks, combinations of individual tracks can yield some amazing results. And now with looping I have been even happier with my current songs. This is a link with Biab and loops from my Mac that I try to sell to a sax player. http://www.reverbnation.com/stonecoled He has purchased quite a few since real tracks came around. There are still a few MIDI tracks in some of the songs, but I find that some sounds are good enough to tweak into use. Here is a link to free loops, some are very good. http://www.looperman.com/