Great lpf. The sweep can get some really deep sounds and as you open up the cutoff, bass decreases in typical 4-pole fashion. The vca circuit is a nice touch for some grit. Oscillating functions are in order and are as pure as a vcf oscillating tends to be from my experience.
After a uVCF and MMG, this is definitely what I was looking for in sweeps. If you're hung up on the bass, don't get 4-pole or turn down the resonance and the problem is solved.