Spalding,Frank,
In Backing Sequence mode you record the song with any fills or other variations etc that you want and save it as a Backing Sequence file.Then you actually use the Backing Sequence mode to play back the song even when playing live and you are able to use all of the functions on the fly as Frank said.
So there's no need to resave anything unless you want to and then as Frank said you open up the recording phase while in the Backing Sequence mode and edit, re-record or whatever at home not on the gig.Ha! Ha!
The song Play mode of the i30 plays just MIDI files. You can convert Backing Sequence files to MIDI.
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I'm not prejudiced, I hate everybody!! Ha ha! My Sister-In-Law had this tee shirt. She was a riot!!!