Studio Electronics Modstar 4075 Filter module

The 4075 filter is a voltage controlled, discrete analog, 24/db/oct cascaded transconductance low-pass filter, employing hand-matched transistors. In its lowest FREQUENCY setting it shaves off higher frequency harmonics; its RESONANCE or Q circuit pushes those harmonics past the self-oscillation boiling point, projecting a thumpy, thrashing squeal, with explosive low to mid-range power and depth. The design is actually pulled from the four-pole ARP 4072 (better: more parts and trims), sans the 12kHz design flaw which hamstrung the originalﾒs high end. The 4075 name has stuckﾗno sense correcting our little misnomer misstep now.

Our 4075 filter is the most requested of the Boomstar filter models, perhaps owing to its uniqueness. Has there ever been a better match for a square wave? It weaves dreams with glidey, 70s basslines, is a natural in the lead department, and feels as if a temper tantrum simmers a mere micron beneath its veneer of faux respectability. Aggressive and articulate, this fresh ARP can snap punishing kick drum sounds out as well as color with bright, edgy, stringy tones for essential arpeggiations.

Potentiometer Potential
Seven attenuation pots control the FREQUENCY, RESONANCE, FREQ CV 1, RESO CV, FREQ CV 2, INPUT and OUTPUT, delivering smooth, detailed, and complex expression.

Switch it Up
Classic Minimoog FULL and HALF strength filter frequency keyboard/voltage tracking for rounder low end with brilliant highs.

Patch it Up
Seven patch points: 1 V/O, FREQ CV 1, FREQ CV 2, RESO CV, INPUT and 2x OUTPUT direct the deepest manipulation.

All Controls & Patch Points
FREQUENCY ﾖ Adjusts the frequency, or cut-off of the filter.
RESONANCE ﾖ Adjusts the resonance of the filter. *
FULL HALF TRACK ﾖ Switch between full and half keyboard/voltage tracking.
FREQ CV 1 ﾖ Frequency control voltage 1 input attenuverters.
RESO CV ﾖ Resonance control voltage input attenuverters.
FREQ CV 2 ﾖ Frequency control voltage 2 input attenuverters.
INPUT ﾖ Adjusts the audio input.
OUTPUT ﾖ Adjusts the audio output.
1 V/O ﾖ One volt per octave control voltage input.
FREQ CV 1 ﾖ Frequency control voltage 1 input.
FREQ CV 2 ﾖ Frequency control voltage 2 input.
RESO CV ﾖ Resonance control voltage input.
INPUT ﾖ Audio input.
2x OUTPUT ﾖ Audio outputs.

* From 7:00 (0) to 9:00 our ﾓNegative Resonance Saturationﾔ adds beefiness, boosting the waveform amplitude and taming waveform transients; set to 9:00 to achieve the cleanest tone possible.