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Modeled after the Roland System 700 VCF, the Frequency Central State 700 VCF is a dynamic filter with two voltage control inputs governing its cutoff frequency. It features dual audio inputs, outputs for each filter type (low-pass, bandpass, and high-pass), and level-adjustment attenuators over every input. This latter feature is important because of the inverse relationship between volume and resonance: lowering the volume increases the resonance and vice versa.