Editing : Edit Modes and Tools : Zoomer Tool : Vertical Zooming In or Out of All Audio Tracks Continuously

Vertical Zooming In or Out of All Audio Tracks Continuously
To vertically zoom in or out of all audio tracks using continuous zoom:
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To vertically zoom in or out of all MIDI and Instrument tracks that are set to Notes view using continuous zoom:
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Drag up or down on the MIDI Zoom In or Out button. Any waveform height offsets will be maintained.
To zoom horizontally and show the entire session, and to reset the audio waveform to show the default height, zoom MIDI to show all notes in a track, and zoom the Tempo Editor to show all tempo events, do one of the following:
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To reset the default audio waveform heights without affecting the horizontal zoom level or MIDI note heights, press Control+Alt+Start+[ (Windows) or Command+Option+Control+[ (Mac).
To only zoom horizontally to show the entire session without affecting vertical zoom or scrolling:
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Press Alt+Start+A (Windows) or Option+Control+A (Mac).
To set all audio track waveform heights to match the waveform height of the topmost audio track in the Edit window:
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Control-Shift-click (Windows) or Command-Shift-click (Mac) the Audio Zoom button. All waveform height offsets will be lost.
To set all MIDI and Instrument track note heights to match the note height of the topmost MIDI or Instrument track in the Edit window:
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Control-Shift-click (Windows) or Command-Shift-click (Mac) the MIDI Zoom button. All note height offsets will be lost.