iTunes 8's new default music visualizer, based on the beautiful Magnetosphere plug-in, has several keyboard shortcuts that customize its look and behavior—not listed in the iTunes help file. Macworld lists them: + and -: Increase or decrease the intensity (brightness) of the particles; multiple presses further increase or decrease the intensity. A and S: Add or Subtract particles to the visualizer
![iTunes 8 Visualizer's Undocumented Keyboard Controls](https://cdn-ak-scissors.b.st-hatena.com/image/square/c273d83645795f3bb865124513a4aa222fabcef5/height=288;version=1;width=512/https%3A%2F%2Fi.kinja-img.com%2Fgawker-media%2Fimage%2Fupload%2Fc_fill%2Cf_auto%2Cfl_progressive%2Cg_center%2Ch_675%2Cpg_1%2Cq_80%2Cw_1200%2F18fcbcsweuvfyjpg.jpg)