The Solo button turns yellow. The Mute buttons of all unsoloed channel strips flash blue, with the exception of external MIDI channel strips.
In Logic Pro, click a Solo button, then drag the pointer horizontally.
The Solo buttons of all swiped channel strips switch to the same state.
In Logic Pro, option-click an unsoloed channel strip.
This action solos the selected channel strip and unsolos any other channel strip.
In Logic Pro, do one of the following:
Click an active Solo button.
Option-click any active Solo button. The solo state of all channel strips is deactivated.
In Logic Pro, Control-click an inactive Solo button.
A red slash across the Solo button indicates that the channel strip is solo-safe. When you solo another channel strip, the channel strip no longer mutes. Control-click again to deactivate the channel strip’s solo-safe state.