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The Hungry Robot VCF is an all analog, 4-pole low pass filter with a self-oscillating resonance control. It is a close replication of the filter circuit found on the famous Prophet 5. It uses a HM2040 which is a high quality, faithful replication of the original SSM2040 chip. This resonant filter has a beautiful tonal quality. The over-sized knobs provide a satisfying tactile response. The cutoff frequency can be controlled by external control voltage. It has a built-in attenuator and invert switch for the incoming CV. CV input does not track at 1V/Oct, but is scaled to act as a VCA when a 5V signal is applied to CV input. As with all Hungry Robot "Modular Boxes" the VCF can be powered by a simple 9V DC, Negative Center power supply.
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