Gnuradio Interface to a Tuning Knob?

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Hi All:

I recall that at one time there was a gnuradio block that interfaced to some sort of physical tuning knob. I am wondering if anyone remembers this and has some details?

My recollection was that the device was from the gaming world, but that it was never that popular so support for it dropped several years ago.

Thanks in advance,

Kevin