ETC Cobalt Family v7.0.0 - Manual (Page 478)

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Channels - Balance Mode
The BALANCE key in the Soft Keys makes it possible to temporarily set all channels to 0% except a
selection, to be able to work with that selection. The original output of the subdued channels is
restored when Balance Mode is exited.
( Soft Key Pages are commands in the lower right corner of screen 2)