This Module is currently available.
A dual channel Voltage Inverter
A dual channel Voltage Inverter that turns your CV signals from positive to negative and vice-versa. This one also comes with an offset control knob, so you can shift your voltage to the desired range.
It also features two leds per channel, to indicate if your output is either positive or negative.
http://www.addacsystem.com/product/addac200-series/addac201-cv-inverter
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These merchants probably sell this module. Huh?