You’ll probably spend most of your time in GarageBand playing back music. That, after all, is the only way to fine-tune and perfect your work.
There’s a Play button at your disposal—the big triangle indicated in Figure 23-1—but that’s for suckers. Instead, press the Space bar. That’s a much bigger target, and a very convenient start/stop control. (You may recognize it as the start/stop control for iTunes and iMovie, too.)
Once you’ve got the 01—Garage Door file open, press the Space bar to listen to this fonky, fonky piece. It’s about a minute long.
If you hear nothing, it’s probably because your Mac’s speakers are turned down. You can adjust your Mac’s overall volume by pressing the volume keys on the top row of your keyboard.
If you have a very old keyboard (or a very non-Apple one), and you therefore lack these keys, you can also adjust the volume by clicking the speaker menulet (the black, right-facing speaker icon in your menu bar).
(If the speaker control doesn’t appear on your menu bar, open System Preferences, click the Sound icon, and then turn on “Show volume in menu bar.”)
Whenever music is playing back, you can manipulate it using keystrokes, some of which should be familiar from iTunes. For example: