Multimode filter with VC resonance; THAT 2180 based.
Multimode filter, 12dB/oct responce. VC frequency and resonance. Clean sound and perfect selfoscillation tracking. Bass boost switch adds basses at high resonance.
http://www.l-1.su/2180VCF.html
Available as an assembled Module and as a DIY project.
This Module is currently available.
$260