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I want to do scratching by pushing a button on my laptop keyboard (instead of dragging the spinning record with my mouse-cursor).

Can Mixxx do this?

Not sure if that's mappable, but I don't think that would provide enough control to get satisfying results.

The ideal interface of course would be to use an external turntable and use one's hand to rotate a physical plate or record.

I find the mouse-cursor drag very clunky.

You can do that with a set of timecode vinyl, Mixxx fully supports that.

How about a USB knob?

Looks interesting, thanks for sharing.