Introducing µTune: Microtonal modular midi interface, quantizer, editor and more. An expander module for µTune and Sumtiple - a precission adder and multiple. Tubbutec produces synthesizer upgrades for Korg Polysix, Poly-61 and Mono/Poly, Roland Juno-6, 60 and SH-101. They not only add midi, but turn the vintage machines into modern synthesizers full of useful features.