Shifty,
I think this one is with mixing or merging 3 filters. It can be done with one changeable filter, which goes from LP->BP->HP like on
http://www.sherman.be. Most filters have one setting (LPF BPF HPF notch ...), even the S-5000 with it's 26 different filters cannot change filter mode without crackles.
I think Native Instruments have a synth that does it, maybe there's one for Pülsar already. It might not be long before you'll be using such a device.