This is a great, very resonant, and musical filter. Continuously variable from Low-pass to Hi-pass response, it also has a switch making it into a V/oct tracking oscillator in a snap, and it has a very large filter cutoff knob, which makes it great fun to play live. I have used this module in a lot of my rigs, and if I weren't shrinking the size of my cases down to something more transportable, I would keep it for sure!