Available as an assembled Module and as a DIY project.
This Module is currently available.
Five-pole near-elliptic low-pass filter
Synthesizer VCF with a unique circuit topology and extremely sharp cutoff (61dB/octave at the shallowest part of the main slope). Built-in VCA, exponential and linear modulation, temperature-compensated V/oct tracking. Functions as a sine wave VCO in feedback mode.
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These merchants probably sell this module. Huh?