Two things:
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Assign a Custom Control fader to multiple inputs, xpoint routing, Zones without tying up a control group. Similarly, the same thing with mutes and other buttons.
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A button, perhaps similar to the ‘Selector’ that can be dynamically paired with a fader, or multiple faders. That could be used in a few different ways: 1) Make it an input selector and the paired fader could control the output to a zone or an xpoint routing send, 2) Opposite approach of the selector could choose a zone and the paired fader(s) could be input levels. These options could allow a more minimalistic GUI to control a vast number of functions.