This Module is currently available.
PHG Expander
Useful expander for the RS370 particularly for users who do not require the real-time additive synthesis capabilities of the RS375 module but want to take advantage of 4 extra CV inputs and 4 controller outputs
The RS376 expands the Polyphonic Harmonic Generator by four CV inputs for controlling parameters of the 370. A potentiometer generating a voltage from -10V to +10V is normalized to the first CV input (Ctrl In 5) what enables you to control a RS370´s parameter manually.
As the RS370 can be used as a MIDI/CV interface, you can use the RS376 to output four programmable MIDI controllers as control voltages.
The expander module has to be connected to the RS370 with a flat ribbon cable.
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These merchants probably sell this module. Huh?