Looking for an example of a "Tuning Knob" animation

Does anyone have (or has seen) a slider animation that displays a a tuning knob that can be clicked on and turned as opposed to slider going left or right.  I am looking to create a slide where the knob is turned and that will then make graphics of volume level indicators increase or decrease.  I've done it with a slider, as the slider goes along the track the levels go up and down, but don't have a clue if a circular knob can be turned using the mouse. Thanks!

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