Playback and Recording : MIDI Recording : Recording MIDI and Instrument Tracks : Canceling a Record Take

Canceling a Record Take
It is also possible to discard the current record take before the Transport is stopped.
To cancel a take while recording:
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Press Command+Period (.) (Mac) or Control+Period (.) (Windows) before the Transport is stopped.
When in Loop Record mode, all takes from each record pass are discarded.