Available as an assembled Module and as a DIY project.
This Module is currently available.
Utility Eurorack module to attenuate, invert and bias 6 channels of control voltages
FLIP is an indispensable utility module to attenuate and/or invert raw control voltages from LFOs, envelope generators, etc, and add them to a bias voltage of up to about +-11V. When the 'Flip' knobs are turned all the way to the right, the amplitude of the output signal is 100% of the input. With the 'Flip' knobs in the centre, the output signal is at 0% amplitude. With 'Flip' all the way to the left, the output signal is completely inverted - in other words, its amplitude is -100%. Without control voltages plugged in to the input jacks, the Bias knobs can be used to output steady voltages of about +-11V.
To save panel space, many Eurorack modules don't have attenuator knobs on some of their CV inputs, meaning that to moderate the effect of a control voltage, you'll need a dedicated attenuator module such as this.
https://www.tindie.com/products/nbirch/flip-hex-attenuverterbias-14hp-eurorack-module/
