Okay, so if there is an answer to this question I'm sure it's very trivial, but I've been looking in the manual and couldn't find it, so...
Suppose I'm real-time-recording something in the sequencer and get a few notes wrong, realizing it would be easier to just redo the recording. Is there a button to press during recording, that discards the recording? The only button that seems to do anything is "Stop" (filled square), and that of course saves the current recording.
This would be especially helpful if the track already has other data (e g if you're overdubbing) where discarding data from a specific recording isn't easily done in other ways.