Mixing : Automation : Automation Playlists : Automation Playlists with Audio and MIDI Clips

Automation Playlists with Audio and MIDI Clips
Pro Tools handles audio clips and their automation playlists differently from MIDI clips and their automation playlists.
Audio Tracks
On audio tracks, automation data resides on a separate playlist from audio data and clips. Each edit playlist on an audio track shares the same automation data.
MIDI and Instrument Tracks
On MIDI tracks and Instrument tracks, all controller automation data except for MIDI Mute data, or audio mute (Instrument tracks only), is stored in the MIDI clip that contains it. Each edit playlist on the track is separate, and represents a distinct performance, complete with controller automation.
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MIDI Mute data is independent of the MIDI data in a MIDI clip. This lets you mute playback of individual MIDI or Instrument tracks in Pro Tools without altering the controller data.