@toodee I went on a real Serge tear awhile back and that's a big part of the why, but the more proximate cause is that I really super love the VCFS (which I had first) but find it also has a pretty distinctive sound, and one that's kind of smooth rather than aggressive and super resonant. So, I wanted to have another filter to mix it up for when I'm building my own 303 (instead of relying on the M303) and to get a little more intense and a darker vibe. That said, I was looking at the rack today and wondering if a Plaits or a 4MS Ensemble Oscillator might make more sense over the VCFQ there, especially if I could sneak in something like a WMD C4RBN. Future plans, TBD!
Stepping back and putting aside my particular acid journey, they are both really unique and interesting filters that don't quite sound like anything else I've used, so if you're curious I would definitely recommend them both, and I have a ton of love for the R*S modules in general too. Hope that helps!
my tunes: https://stevehand.bandcamp.com/