Sessions & Tracks : Tracks : Soloing and Muting Tracks : Solo Latch Options

Solo Latch Options
Solos can be latched (where pressing subsequent buttons adds them to the soloed mix of tracks), unlatched, or temporarily latched (Pro Tools HD and Pro Tools with Complete Production Toolkit only).
To select a Solo Latch mode:
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Choose Options > Solo Mode and select from the following options:
Latch
When selected, pressing subsequent Solo buttons adds them to the soloed mix of tracks.
X–OR (Cancels Previous Solos)
When selected, pressing subsequent Solo buttons cancels previous solos.
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To override X–OR mode and solo more than one track at a time, hold the Solo button on the first track. Subsequently pressed Solo buttons will latch.
Momentary (Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
When selected, Solo buttons are not sticky. A track is soloed only when its Solo switch is held down.
With a qualified control surface, additional tracks can be soloed by pressing their SOLO switches (as long as at least one Solo button is held down). When no SOLO switch is held down, all soloed tracks will unsolo.
Temporarily Latching Solos in Momentary Solo Mode
(Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
To temporarily latch solos:
1 Choose Options > Solo Mode > Momentary.
2 Press the Solo button on the first track that will be soloed.
3 While holding the first Solo button, press additional Solo buttons. Solo buttons remain soloed as long as one Solo button is held.
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As long as at least one Solo button is held, all the solos will remain latched.