Lucky you! I haven't taken the plunge of modular yet (I'm afraid it's a hole I would never get out of) but I play around with VCV and love it.
I also have a Volca Modular which doesn't have a MIDI input, only CV/Gate and was thinking about adding a CV output to the thing.
A real theremin module is probably much more precise than sonar sensors; I use HC-SR04 because they are so cheap but they are really unstable, the values they return tend to jump around a lot. I try to compensate for this in software but it's not perfect yet.
I also have a Volca Modular which doesn't have a MIDI input, only CV/Gate and was thinking about adding a CV output to the thing.
A real theremin module is probably much more precise than sonar sensors; I use HC-SR04 because they are so cheap but they are really unstable, the values they return tend to jump around a lot. I try to compensate for this in software but it's not perfect yet.