This Module is currently available.
Theremin solar power in between CV out from 0-5 volts
Superbooth 2023 version of Eraserhead Theremin
Solar powered Theremin
CV out from 0 to 5 volts
and everything in between
only 6hp
see demo
https://www.errorinstruments.com/a-59511162/error-modular/eraserhead-theremin/#description
These merchants probably sell this module. Huh?
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Doepfer A-178 Theremin Control Voltage
Doepfer A-178 Theremin Control Voltage
Doepfer A-178V Theremin Control Voltage