Pro Tools:Zoom commands and buttons

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Zoom buttons
The zoom buttons in the transport (numbered in the image below) do the following




 * 1) Horizontal Zoom Out button. This changes the time view of the session by compressing the time display of all tracks in the session.
 * 2) Audio Zoom In And Out Button. This button changes the displayed amplitude of all waveforms of all audio tracks in the session.
 * 3) MIDI Zoom In and Out button. This compresses or expands the note range shown in MIDI tracks.
 * 4) Horizontal Zoom In button. This changes the time view of the session by expanding the time display of all tracks in the session.