In perusing the manual, it looks like you can record a new song 2 ways...record the keyboard performance and the backing tracks all at the same time, or just record the keyboard performance by itself. When adding additional material to an existing song, you can record one track at a time, or re-record a specific region of a track (punch-in\out). You can edit Performance Functions, Fx and Tones...but sadly, there are NO onboard editing functions for sequenced Songs!

Too bad...

Michael