The motion reminds me of the “crab scratch,” [1] a DJing technique that uses finger tapping to move the cross fader rapidly in a similar way. I wonder if someon

The motion reminds me of the “crab scratch,” [1] a DJing technique that uses finger tapping to move the cross fader rapidly in a similar way. I wonder if someone brought the technique over from DJing or if it’s a kind of convergent evolution. [1] https://www.studioscratches.com/secrets-of-the-crab-scratch/ https://www.studioscratches.com/secrets-of-the-crab-scratch/