This is just badass! It never ceases to amaze me when I see folks create projects like this for the C64. Steve Smit has built a robotic guitar player and software for the Commodore 64 and has a short demo on his youtube page Smitties Projects. There’s a couple of older videos as well however with the current version 2.0 he’s really hit the nail on the head. Click the link at the bottom of the article for more of Steve’s C64 Robot Guitar videos.