I have a wk3000, connected to my pc. I have Voyetra record producer and Power Tracks software to record midi songs. When I use record producer(been using this one so far), I record one track(drums), then go on to record another(bass). When I playback, it plays in the last sound I have the keyboard set to(all tracks play drum sounds, bass sounds, piano sounds, etc). How can i record tracks and they STAY playing what I've recorded them in?