MusicMik demonstrates what VCO sync looks like with an oscilloscope:

I made this video during development of another VCO, my synchronization master is just a provisoric square oscillator, which produces a very unclean signal. Besides this i don’t have the audio equipment in the lab to create a better audio on this 🙂 But the main syncronization effect is visible and hearable.

Schematics might be released soon, after drawing and final check.