Question about the track list in the project window

Cubase
1

Hi, I would like to know the meaning of the short vertical line in gray between track type icon and the mute button in the track list of the project window.
image

Does anybody know or refer me to the related chapter in Steinberg Help? Thx a lot in advance!

2

Hi,

This line shows you, which channels are currently visible on your hardware controller (Mackie Control or MIDI Remote Device).

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