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Discrete Core Ladder VCF, from ACL, is comprised of three signal inputs and corresponding volume controls. If the introduced signal is outside the range of 8 vpp saturation will result. The filter has both cutoff and resonance pots, as well as three cv pots and attenuators. Two inputs preside over the cutoff frequency while the third governs the resonance parameter. There’s also a 1v/Oct input that comes in handy when the filter is self-oscillating, enabling it to track over 5 octaves! Of course, this means that the module can be configured as a quadrature VCO as well!