This first DCO prototype uses the Arduino 16 bit timer (timer1) and the midi-in solution from Kuk on the Arduino forum

The Arduino has a hardware 16 bit timer (timer1). This timer offers 15 different counting modes. One of these modes is the so called “Clear Timer on Compare Match (CTC) Mode” (Mode 4):

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Finally I figured out a name for the prototype! The Sinneb Sine.