ALM Busy Circuits MCFx2

Name: MCFx2
Brand: ALM Busy Circuits

State-variable MCF filter made double.

14 HP Eurorack module

A dual state-variable MCF filter with two analog cores, direct control, and voltage control of each filter's cutoff and resonance.

Features

Two identical classic analog three-pole state-variable filter cores.
Supports serial and parallel filtering configurations.
Each filter output is three-pole with an 18 dB/octave slope.
Rear jumpers independently select band-pass or notch operation for each BP/Notch output.

Controls & Jacks (24)

Feed— Routes the left filter output to the right filter input unless the right input is patched; the rear jumper selects which left output is fed.
Left Resonance— Sets the resonant peak level of the left filter; high settings can drive it into self-oscillation.
Link— Links the left cutoff control to control both filter cores in parallel. With the right cutoff fully clockwise, both filters track together.
Right Resonance— Sets the resonant peak level of the right filter; high settings can drive it into self-oscillation.
Left Frequency CV Attenuverter— Attenuverts the left cutoff-frequency CV input and combines it with the cutoff knob offset.
Left Cutoff— Sets the base cutoff frequency of the left filter.
Left BP/Notch Output— 18 dB/oct band-pass or notch output from the left filter; the rear jumper selects the mode.
Left Resonance CV Attenuverter— Attenuverts the left resonance CV input and combines it with the resonance knob offset.
Right Frequency CV Attenuverter— Attenuverts the right cutoff-frequency CV input and combines it with the cutoff knob offset.
Right Resonance CV Attenuverter— Attenuverts the right resonance CV input and combines it with the resonance knob offset.
Right Cutoff— Sets the base cutoff frequency of the right filter; when Link is enabled, it sets the right core's maximum cutoff range.
Right High Output— 18 dB/oct high-pass output from the right filter.
Left Low Output— 18 dB/oct low-pass output from the left filter.
Left High Output— 18 dB/oct high-pass output from the left filter.
Right Frequency CV Input— CV input for the right filter cutoff, processed by the right frequency CV attenuverter; expects approximately -5 V to +5 V.
Right Low Output— 18 dB/oct low-pass output from the right filter.
Right BP/Notch Output— 18 dB/oct band-pass or notch output from the right filter; the rear jumper selects the mode.
Left V/Oct Input— 1 V/oct cutoff-frequency input for the left filter; permits key tracking or sine-like self-oscillation use.
Left Frequency CV Input— CV input for the left filter cutoff, processed by the left frequency CV attenuverter; expects approximately -5 V to +5 V.
Left Resonance CV Input— Attenuated CV input for the left filter's resonance; expects approximately -5 V to +5 V.
Right Resonance CV Input— Attenuated CV input for the right filter's resonance; expects approximately -5 V to +5 V.
Left Audio Input— Audio input for the left filter. This input is normalled to the right audio input unless Feed is enabled.
Right Audio Input— Audio input for the right filter. It receives the normalled left input unless a plug is inserted or Feed is enabled.
Right V/Oct Input— 1 V/oct cutoff-frequency input for the right filter; permits key tracking or sine-like self-oscillation use.

Explore the interactive MCFx2 panel on BleepDex — tap any control to learn what it does.