Erica Black VCF is dual multimode filter with CV control over cutoff and resonance for serious modular patches. The core of the VCF is highly stable, custom multimode VCF chip AS3320 (produced in Riga, btw). It can be used as two independent VCFs with simultaneous HP, BP and LP outputs, controls can be linked for stereo application and both VCFs can be chained in series or parallel to the summing output for ultimate modulations. Bonus feature – 16 band spectrum analyser – gives visual feedback on what happens on summing output.  Features: Two identical multimode VCFs Simultaneous HP, BP and LP outputs Summing output CV control over Cutoff and Resonance CV level attenuverters Link switch for controlling both VCFs with one cutoff or resonance knob 16 band spectrum analyser Skiff-friendly design   Technical specifications: Audio output amplitude 10 Vptp CV input (full sweep) 10 Vptp Panel width 18HP Module depth 35mm Power consumption 40mA@+12V, 36mA@-12V     Erica Black Dual VCF on Modulargrid User manual