Realton 'Variophon Standard'
The Variophon  is a vintage Wind-Synthesizer (1980) of the German company Realton (not existent any more). It was manufactured in various variants. For more information please refer to Variophon.de.
Research of the Variophon Standard has been stopped due to leak of time in 2014.
At least the 'Variophon Standard' bears lethal electrical risks and must not be operated without modifications or safety precautions as described here.