Ginette - DIY instrument based on the ondes Martenot

I designed and built this instrument during 2010-2011. The idea is based on the ondes Martenot that was invented by Maurice Martenot in 1928. My instrument is named ’Ginette’ after Ginette Martenot - an ondist and the sister of Maurice Martenot. She played ondes Martenot at the premiere of Olivier Messiaen’s Turangalîla-Symphonie. The heart of the instrument is a voltage-controlled oscillator (VCO) that produces the sound. I found great VCO design from Music From Outer Space -website. The VCO produc