

Pressing F and L (not at the same time) gives you an idea of how these two settings are related. This locks the visuals to more or less the same position on the screen. If you press E while in this mode, the clouds are enhanced. This adds iridescent clouds to the display. N toggles nebula mode (though some modes don’t display nebulae).

This is a lot better for ambient music, which, as I mentioned above, dances too much with the default settings. This doesn’t freeze the display entirely, but it greatly reduces the movement, telling the visualizer to rotate but not dance around the display. If you see a visual you like, press F to freeze it so you can take a screenshot. If you find a mode and palette you like, press C to keep that combination. This is on by default, and this tells the visualizer to change mode and palette at random.

(To be fair, I find it a bit too busy for ambient music, where the lights should be more relaxing. You’ll see that percussive songs lead to a lot of effects, but the visualizer also adapts to mellow music to provide a constantly changing palette of colors and shapes. The more changes there are in the music, the livelier the visualizer will be. Select this if you’re playing music from a playlist that contains music videos, and you want iTunes to play the videos when it gets to them, rather than use the visualizer. If you choose View > Visualizer, you’ll see that you can choose from several different plug-ins. If that’s all the visualizer did, it would be pretty cool, but it gets a lot better.
