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Physical Knob on a Touch Screen

I found these neat suction cup physical knobs for touch screens, 

Has anybody tried using a Tuna Knobs physical knob on a LabVIEW Knob (or dial) Control?

How did it work?

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I haven't used them before, but I can anticipate some issues, like getting them to line up with the on-screen dial, and how to deal with knobs that are "pegged".  (Both pretty minor.)


The bigger question might be about what to do when the users get spoiled and want physical representations of graphical controls for ALL the front panel objects?  😄

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