You can draw automation for audio as well as MIDI tracks. For example, use the Triangle pattern to control continuous functions, or the Square pattern to control switched functions such as Mute or Bypass.Since the Pencil tool draws these shapes using the current Grid value, you can use it to perform panning in tempo with a music track, or on frame scene changes when working in post production.
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For more information on MIDI continuous controller data, see Continuous Controller Events.