I have a Yamaha RY10 that I'm just learning to use. I accidentally pressed the fill button while editing a song, and now can't get rid of the fill. Does anyone know how to undo the fill or delete the measure from the song? I tried changing the pattern for the measure, but it keeps the fill. I can insert a new measure, but it still leaves the old one at the end. The manual is a bit less than adequate on some things. All I can do at this point is rebuild the song from the beginning. Any help would be appreciated.