Available as an assembled Module and as a DIY project.
This Module is currently available.
Kick drum & bass voice with 2 AD/AR envelopes & MM VCF
Bass and more! B2 contains everything you need to create deep, thumping kick drums or cutting bass lines in one compact 14HP unit: A 1 V/Oct VCO with 4 waveforms, a 3-way waveform mixer with sub-octave sine wave, 2 fast, switchable AR/AD envelope generators, a high quality VCA, and a multi-mode VCF for additional tone shaping!
Features:
+ All-in-one fat sounding analog monosynth for basses and kick sounds
+ Wave mixer blends from sine to sawtooth, 2x frequency saw, or square
+ Sub-octave sinewave oscillator
+ CV ins for velocity and filter's cutoff
+ Also available as a DIY project
These merchants probably sell this module. Huh?