From ChrisLody on YouTube, via matrixsynth.

Okay, so this is one of my more strange experimental ideas. The keyboard at the top of the screen (a Yamaha SY-35) is midi’d into the lower keyboard (a Novation KS-5). The KS-5 is programmed with a simple arpeggio patch I created which can be played from the SY-35. Then I covered the keys of the SY-35 with cat biscuits and let my kitten Daisy loose on it. I was then able to control some aspects of the sound with conrols on the KS-5. I think she got wise to me about half way through as she stopped standing on the keys. Damn kitty!