I have one MIDI track recorded with lots of tempo changes, but with the meteronome set to 120bpm throughout. I created a second MIDI track and manually inserted a note on every beat in the music. Each track starts at 1:01:000, contains a single clip, and is the same length. I select the second track, and invoke Process->Fit improvisation. Nothing happens, no momentary UI freeze, no change to either track, no popup message. I think I'm following the directions to the letter, except that I didn't "record" the second track from the keyboard, but its event list is just a big long list of Note events and nothing else. What could I be doing wrong?