Apple GarageBand '09 - Manual (Page 116)

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Keyboard Shortcuts
Action Shortcut
Navigation/Moving the playhead
Play/Pause Space bar
Go to beginning Home or Z
Go to end End or Option-Z
Move back (the amount depends on zoom level) Left Arrow
Move forward (the amount depends on zoom level) Right Arrow
Move back in larger increments Option-Left Arrow
Move forward in larger increments Option-Right Arrow
Move back by the visible width of the timeline Page Up
Move forward by the visible width of the timeline Page Down
Zoom out Control-Left Arrow
Zoom in Control-Right Arrow
Tracks
Create new track Command-Option-N
Duplicate track Command-D
Delete selected track Command-Delete
Select next higher track Up Arrow
Select next lower track Down Arrow
Mute/Unmute selected track M
Solo/Unsolo selected track S
Show/Hide track automation curve A
Lock track L
Show/Hide arrange track Command-Shift-A
Show/Hide master track Command-B
Show/Hide podcast track Command-Shift-B
Show/Hide movie track Command-Option-B
Turn ducking on/off Command-Shift-R