Apple Logic Pro 8 Getting Started - Manual (Page 106)

106 Glossary
zoom control The control that appears at the bottom right of some windows, such as
the Arrange. The zoom control slider allows you to navigate through the entire length
of the currently displayed project. The lines on the left and right of the slider can be
clicked to zoom in and out by a fixed percentage.
zoom level The amount that window contents (tracks and regions, for example) are
magnified. Zooming in to a high level allows you to make more precise edits.
Conversely, you can zoom all the way out to see the entire project and work on very
large sections.
Zoom tool This tool allows you to zoom in on any part of the active Logic window. You
can choose this tool from the Toolbox, or activate it when using other tools by holding
down the Control key and clicking.