I have recently purchased this Filter as it was recommended to me by another musician and i am not dissapointed.
This Filter is so unique in features and for the price you can't go wrong, especially when you turn the resonance all the way up and play around with the input volume. It delivers so unique harmonies of the resonnance that sometimes feel it is modulated by white noise.
Another incredible feature is that it is HP,BP,Notch and LP with 2 differnt outputs so you can use one filter with 2 different settings at the same time.
The only slight downsize is that when you use the mix between the HP and LP the signal is quite low and need to be amplified slightly.
Lastly i would recommend getting the Black and Yellow Special edition that really looks cool like a......Wasp :)
Lastly i would like to point out that the quality of this unit and Doepfer units is excellent. The units are made from very good quality parts and all the soldering is done like it would have been in the 80's.
Overall an excellent product and a must for every modular system owner looking at an unusual filter.
Get the special edition one while it's still available.