Apple Logic Express 8 - Manual (Page 214)

214 Chapter 9 Working With Tracks
Using Track Button Slide Activation
Track buttons on arrange tracks (Solo, Mute, Hide, Track Protect, 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 Express, click-hold on the Mute button
of one track, and drag the mouse up or down. The Mute buttons of all swiped tracks
will switch to the same state.
Simply drag over the Mute buttons of the same tracks to undo the Mute.