Note: this is an excerpt from the Playback User Guide.
Playback for Mac supports keyboard hot key controls for the Transport controls and general navigation. Here is the list of the keyboard shortcuts currently available in Playback:
Transport Controls
Space Bar = Play/Pause
P = Pad On/Off
F = Fade In/Out
L = Loop
I = Infinite Loop
Setlist Navigation
Left + Right Arrow Keys = Browse through the song sections, when tracks are playing or paused
Return/Enter (while tracks are playing) = Confirm ReOrder to new section
Keyboard Numbers
While playing = Live Crossfade to corresponding song in setlist
While paused = Select corresponding song in setlist