Using song to only record/playback registration changes

[konaboy32]

I have a registration bank containing 10 registrations for the different parts of my song.

I've been using the sequence feature and footpedal to step up through the registrations as I perform.

But still quite tricky to trigger the transitions in time.

I had the idea of recording a song, but only to capture the registration changes.

Everything else, the left hand and right hand would be performed live as the song plays back.

Seems like a great idea, but is it possible?