The more I use external controllers the more I think this would be useful.
On occasion I twiddle a knob and I don't immediately realise which part of the device it's effecting.
It would be helpful if my eye was drawn to the right knob, button or slider when I change the value with my controller.
It's not a critical feature by a long shot but I do think it would be cool if the effected part glowed or got a coloured outline when changes happen.
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I live in Lancashire, England.