Ripples
Liquid filter
It filters.
Ripples is a classic, big-sounding analog four-pole filter in a small
8-HP package. Over the years it has earned its reputation as a no-fuss,
elegant choice.
Ripples has two input paths: one with a drive control, allowing the
signal to be distorted (or providing enough gain for the processing of
line-level signals), and the other totally transparent, preserving the
clean-sounding character of the original version of the module.
Three filter modes are available: high-pass, band-pass, and low-pass.
The slope (2 or 4 poles) of the band-pass and low-pass outputs is
switchable.
Self-oscillation is available for all modes and produces a clean
sine-wave on the low-pass 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 Japanese classics from the 80s, with a
very round and liquid resonance.
The low-pass output goes through an internal VCA. This makes Ripples a
good final stage module for an inexpensive, or space-constrained,
subtractive synthesis synth voice.