One reg per song would never be enough for one song...the way I like all the various orchestra sounds etc. I do this the same way I did on Yamaha Organs.....Call up a bank...start with reg 1 use as many as I need in the song ALL within 1 Reg bank. Simple and as Rikki said makes using a foot sw or button to seq. through the red's as you play the song. Just put the banks in each as a Playlist entry.