Folk Computer is a system for reactive computing within a physical environment. It tries to push state out of the computer and integrate it into the tangible world, while maintaining at least some of the malleability of software. (At least, that’s my view of it.)
I wrote some library code to allow it to interface with Supercollider, which is documented a little on Folk’s wiki if you want to try it yourself on a Folk instance.
I then used this to build a simple sample looper, of which I have some videos of early versions: