happymoogman Dana Countryman gives an overview of his awesome DIY project, his take on the Ondes Martenot:
Here is part two of my progress, building an Ondes Martenot-style controller for my modular synthesizer.
Feel free to use my ideas, but no, I will not be building one for you!
I built this around my beloved DX-7, but it only uses that keyboard for visual reference, while playing the ring controller. You could use ANY keyboard for your own reference. – Dana Countryman
See this post for the first part of Countryman’s Ondes Martenot project coverage.