Mixing : Basic Mixing : VCA Master Tracks : VCA Slave Track Control Indications

VCA Slave Track Control Indications
Unlike VCAs on traditional analog consoles, VCA Master tracks in Pro Tools directly affect their slave tracks, so that the controls on each slave track always show their actual values:
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The output level of each slave track is indicated by the position of its fader.
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The solo, mute, record enable, and TrackInput status of each slave track are indicated by the corresponding controls on the track.
This ensures that even when a VCA Master track is not visible, the true state of its slave tracks is accurately displayed.