Peter, while you're thinking about that space bar start/stop, it would be nice to have the space bar default to "Replay" if that function is enabled. That is, if changes require a new 'compile' of the song then the Play function should be hit; if there's been no change to the song then that space bar should quickly hit the replay instead of regenerating the song. If I'm standing, then I'm likely in 'performance mode' or 'practice mode'. When I'm practicing, I want to hit that bar and stop/start the song quickly. IMHO.