I assume you have some documentary evidence of that, Diki. I can only go by my experience, and the experience and statements of dozens of individuals on this forum, and two other sites I've frequented over the past decade or more. They all say the same thing I said above - no one gives a tinkers damned if they can see your hands or not. Now, you're going to try to tell me, and everyone on the General Arranger Keyboard Forum of The Synthzone that NO ONE has ever come up while you are playing and singing and asked you questions? Give me a break!
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)