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Yea, it's simple once you figure out it's only using the y axis, but a bit dissonant that it's visually encoded on a circle/knob.

That said, really awesome demo!

It was actually intuitive to me.

But I'm used to interfaces for VSTs (audio generation/effects plugins) that usually have this exact interaction mode. See http://www.protoolerblog.com/wp-content/uploads/screenshot_O... for an example of one.

(Sometimes VST knobs also have the extra of horizontal movement being a "fine-tune" mode, even, which is very handy.)

I always found it strange that VST knobs were actually sliders in disguise. After a while you get used to it, but I can see how confusing it might be to users.

My favorite dial control is this JQuery Knob plugin: http://anthonyterrien.com/knob/

If he wanted the knobs to look exactly like his existing dials, I'm sure it wouldn't be hard to modify the plugin and add an extra dot at the position of the value.