Dude wires his own muscles into an analog synth circuit

Cameron writes: "I've been working on a bit of DIY I think you'll find interesting; I built a little analog amp/feedback system and I'm using electrodes attached to my forearms to control the thing. The feedback path runs through my body and creates the oscillations you hear. It sounds a bit like a theremin but I would say it already has a broader sound palette, though keeping it under control can prove to be a challenge." My favourite line from the video: "Immediately, you will hear the sounds of my muscles." So. Is this BS, old science, or something new?