Interesting thought... Never tried that one out. Might work on some of the keyboard sounds, like piano or guitar simulations..

I have some time coming weekend and see or one of the guitar pedals will do the trick...
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76