I've composed several 4 or 8 bar 'ideas' on my QY-70...but would like for them to loop continuously... Is there a function to "loop measures so-and-so"...? If I hold down shift + play...it attempts to loop what I have--but is adding a blank measure to the end of what I have before starting the first measure again...but when I try to delete that measure--it says "no data." Ideas?