Apple Logic Pro 9 - Manual (Page 101)

To zoom in
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Click the widely spaced bars to increase the zoom level.
You can drag the zoom sliders to step through several zoom levels. Any relative size
differences between tracks are retained when zooming.
Command-clicking a value in the zoom control sets the zoom slider to the respective
zoom level.
Zooming with the Playhead
The playhead can be used to zoom in and out on the working display area.
To zoom with the playhead
1 Click-hold in the lower section of the Bar ruler.
2 Drag the top of the playhead up or down.
Zooming with the Scroll Bars
The scroll bars not only allow you to move through your arrangement and editing
windows; they can also be used for zooming.
To zoom with the scroll bars
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Click-hold the zoom handles at either end of the scroll bar, and drag:
• Up or down on the vertical scroll bar
101 Chapter 4 Customizing Your Window Setup