........because I didn't think anyone would seriously attempt that.

Matt-
It was neither laziness nor overly high expectation that made me push the button while the song was playing. It just worked that way....as simply as muting a part with a keyboard shortcut. Picture yourself blowing over "All the things you are", wanting some musical elrom room so there are now TWO bars of Fm7, you push the expand button...and voila, you're there!
As I said, in the stopped state it was trickier. The program WOULD double the tempo, needing the adjustment. But "on the fly" it kept it in line. Real Tracks did change all of this, adding an extra step of having to "halve the tempo" once the chords are expanded. Thanks everyone for your valuable input. and Trevor....your "shot in the dark" made this crystal clear.
Dan Axelrod