Measure time between two gates?

My overall goal: to use “rapidness” of triggers as a control parameter. I want to tap a MIDI button and have a CV rise/fall as I tap faster/slower. I think I need something like a stopwatch, with an Out for the “lap” times and from there, I can sample&hold and attenuate measurements. The closest thing I can think of is a tap-tempo, but I don’t need it to guess at an overall “rate.”

Any modules that could help me build this mechanism, or any workarounds?

Maybe experiment with clock multi div from Nyshi.

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Envelope follower comes to mind. Use it as low-pass filter smoothing out (aka. averaging) the gates.

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Without the need to keep on tapping :

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