Dr Ben has been learning about 'Radionics' apparatus - used by mad people and sold on the Internet. They're not strictly speaking musicical (or functional in any way), but they look like old synths, and use words like 'resonance' a lot, so I thought it would be OK. There seem to be a dozen or so brightly-coloured knob boxes on the 'bay at any time. #5604545811 claims: "This is a mindmachine. Only needs the power of your will, thoughts and imagination, does not need a battery or any other electric powersource." #5598986177 is a rather chic white Apple-style box, which claims to be a Bio-Photon Analyser, which will "Neutralize chemicals and pesticides that are on food." It's not all good, though, as Ben says "#5603004238 is obviously from when it got boring and digital and they stopped having one knob per function. The data entry wheel. Scourge of so many fields."