Playback and Recording : MIDI Recording : Recording MIDI and Instrument Tracks : Recording Over Existing MIDI Clips

Recording Over Existing MIDI Clips
Unlike audio clips, existing MIDI clips are never overwritten even though MIDI data within clips can be overwritten. When MIDI Merge mode is disabled and recording MIDI on a track with existing clips, newly recorded MIDI data overwrites existing MIDI data within existing clips, but the existing clip boundaries remain. New MIDI clips are only created to fill the gaps between existing MIDI clip boundaries. Typically, new MIDI clips are always created on barlines. However, if existing clip boundaries are not on barlines, newly created clips are bound by the existing clips.
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It is possible to have the Note On of a MIDI note be in one MIDI clip, and its Note Off be in a subsequent MIDI clip. It is also possible to have the clip end before the Note Off, resulting in notes that extend beyond the clip boundary. However, Note Ons can never precede the beginning of a clip.