Apple Logic Pro 9 - Manual (Page 252)

Clicking a Track Protect button toggles between Locked and Unlocked modes.
Command-clicking a Track Protect button in the track list protects all tracks in the currently
selected display level (or folder). If tracks were already protected, they will be unprotected.
Using Track Button Slide Activation
Track buttons on arrange tracks (Solo, Mute, Hide, Track Protect, Node, Freeze) support
slide activation, which is similar to running your finger across several channel strip buttons
on good hardware mixing consoles.
As a usage example of slide activation in Logic Pro, click and hold the Mute button of
one track, and drag the pointer up or down. The Mute buttons of all swiped tracks switch
to the same state.
Simply drag over the Mute buttons of the same tracks to undo the Mute.
Drum Replacement or Doubling in the Arrange Area
Logic Pro offers the drum replacement or doubling feature, which allows you to change
drum sounds on an audio track without having to rerecord the entire track. You can use
an audio track that contains a recorded single drum signal to create a software instrument
track with matching MIDI trigger notes, which is then played by the EXS24.
To replace or double a recorded drum signal
1 Select the track that you want to modify.
2 Choose Tracks > Drum Replacement/Doubling (or use the corresponding key command).
252 Chapter 9 Working with Tracks