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Mutable Instruments Ripples Liquid Filter Ripples delivers a classic, big-sounding analog four-pole filter in a small 8-HP package, continuing Mutable Instruments’ lineage of warm and tasty filters started by the Shruthi SMR4 mkII and 4-Pole Mission.
3 filter modes are available: 2-pole band-pass, 2-pole low-pass, and 4-pole low-pass. Self-oscillation is available for all modes and produces a clean sine-wave on the LP4 output. Unlike many classic 4-pole designs, this filter does not suffer from “loudness drop” when resonance is increased. The resonance loudness compensation circuit brings a slight tone coloration reminiscent of the Roland SH/Jupiter filters, with a very round and “liquid” resonance. The 4-pole low-pass output is additionally sent to a VCA. This makes Ripples a good final stage module for an inexpensive/space-constrained subtractive synthesis synth voice. Un-attenuated frequency CV calibrated for 1V/Oct tracking of the self-oscillation tone over 4 octaves. Frequency CV with attenuverter. Resonance CV. Self-oscillation starts at 4V. Control voltages above 5V are non-linearly compressed, for fine control of resonance overdrive. Mutable Instruments Ripples Liquid Filter Features: Cutoff knob range: 18Hz to 18kHz. Fully analog, based on the V2164 low noise/distortion quad VCA chip, and LM13700 OTA for that extra bit of non-linearity. Frequency CV inputs impedance: 100k. Frequency CV with attenuverter 2-pole band-pass. 2-pole low-pass. VCA level for the LP4>VCA output 4-pole low-pass. 4-pole