I know the principle from this module from the Perfourmer synth of Vermona, and so I was als oexcited to see I could build my own rotating osccilator poly synth thanks to this quad midi. It's not the cheapest interfac,e but certainly one of the better ones if you ask me. It offers plenty of feautures, and is well designed and built , as you would expect from Vermona. I do think the module is a bit large, and compared to ie. the Yarns from Mutable, it takes up much space in your rack, but it's certainly worth it. it is very easy and straightforward in use, and I like switching modes often during sessions, which is no hassle to do.