After Later Audio Waves

This is an exact hardware replica of the Mutable Instruments Ripples V2 module. Below is the description of Ripples.

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.

• Width: 8HP
• Depth: 25mm
• Power: 35mA @+12V / 35mA @-12V

Features

Inputs

• Signal in
• Frequency CV 1 (1V/Oct)
• Resonance CV. Self oscillation starts at 4V. Control voltages above 5V are non-linearly compressed, for fine control of resonance overdrive
• Frequency CV 2 (with bipolar attenuator, from -1V/Oct to 1V/Oct)
• VCA level. Control voltages above 5V are non-linearly compressed.

Controls

• Cutoff frequency, 18Hz to 18kHz
• Resonance (self oscillation at 80%)
• Attenuverter on Frequency CV

Outputs

• 2-pole BP
• 2-pole LP
• 4-pole LP
• 4-pole LP attenuated by VCA