add-on for MFB's triple-oscillators OSC-01/02

(Manufacturer's description:)

The MIXER OSC module is an add-on for MFB's triple-oscillators OSC-01/02. It is not to be used as a stand-alone mixer. It is bridged to the OSC-module using six wires from the circuit board, allowing for individual volume control for the oscillators.

• ? mA +12V
• ? mA -12V
• ? mA 5V

No info about availability.