Yesterday I received Erica Synths' Monster Case, new Black VCO and Expander, and the Fusion Mixer V3. Excited to hear the new VCO I patched it to the mixer along with the sub mix, twiddled the knobs and had a great time. (All while I should have been doing other things.) The VCO sounds amazing. Clear and crisp. And a lot of grit if you want to dial it in. Then I ran the output through Erbe-verb just for giggles. Holy Cow! I have never heard Erbe-verb sound so good. I've since played with the Black VCO more and the expander. Love it. Top quality build and the sound is amazing. Finally, the VCO also sounds great through Rossum's Evolution filter. I wonder how Evolution compares with Erica Synths' Fusion VCF.