Peter Wiessenthaner has created an Electronic String Instrument in collaboration with Thomas Perizonius and Ulf Schaedla.
Peter uses a Teensy 3.6 and a PJRC library for the PWM control, which allows a great amount of fine adjustment. There are two pickups on the right and left of the string, allow composition to represent different overtone curves over the speakers. The fast movements of the motors can lead to highly rhythmic patterns. Peter posted about the project as well as uploading a demonstration to his YouTube channel.