Next to the play/stop buttons is a little round symbol, that i think goes read when pushed... athough i might be getting confused with Reason. Anyhoo, click this (it's a 'record' button) and start playing the song, as you go along you can adjust the sounds, volumes, tempos, balances, and any other variables. When the song's over, unclick the record button, and play the song back, now it will auto do ehatever you did to it when recording. You can record over and over again to easily add these variables to all the different instruments too. good luck!