Protools shortcut keys select all
protools shortcut keys for selection options
mac + win
alt+click = select all
eg, to mute all tracks hold alt + click mute
this works on most things – mute, solo, etc – it doesnt work on faders, pressing alt and clicking a fader puts it back to unity.
to only affect selected tracks, first select the tracks, then
eg, select the first 3 tracks (or a group of tracks, etc) then shift+alt+click on solo, only the three selected tracks will solo.