The following keys aren’t shown on the Help screen:
- A and S add or subtract rays in the current mode.
- + and - increase or decrease the brightness of the rays.
- R resets rays and their brightness to their defaults.
Note that you can pause and resume playback while the visualizer is active by pressing the spacebar, and you can skip tracks by pressing the right-arrow (next) or left-arrow (back) keys.
You can choose from other visualizers by selecting one in the View > Visualizer menu. The settings available for each visualizer are different. For the iTunes Classic Visualizer, see this article. It’s a lot less interesting than the newer iTunes visualizer.
You can make lots of interesting desktop backgrounds using the visualizer. Just press Command-Shift-3 to take a picture of the screen at any time; it will be saved on the desktop. Open System Preferences, click Desktop & Screen Saver, then Desktop. Drag an image to the well near the top of the window to use it as your wallpaper.
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