Theremin with Pure Data as Software DSP running on Raspberry Pi or a standard Computer.
The Pd Patch variies the Sound of a classic Theremin using different CCRMA SynthesisToolKit (STK) instrument synthesis models.
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For more information visit the projects webpage: http://suit-blog.net/articles/thereOHM/thereohm.html
There you can find a detailed description (in German language)