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I have a video of a guy doing something like this on a Casio. On of the tricks is doing rolls on a single note. On the left hand it would go like this: 4321234321234...on any ONE key. He says it took hom a long time to get right, and it is not a skill that even a good piano player would necessarily have.

I knew an accordion player who could really crank out these single-note rolls. He got a unique kind of tremolo/sustain effect that was quite exciting when used sparingly.

Douglas Wolfe

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