The NYLE FILTER is an adaptation of the Steiner Filter for the AE modular system. It contains the classic filter types lowpass, highpass and bandpass with adjustable filter frequency and resonance. The unique feature of this filter type is that there are separate inputs for the different filter types (not separate outputs as with other filters). Each input has its own attenuator. This allows quite unusual sounds, if different signals are fed into the different inputs.
It is an unusual filter in that the cutoff resonance can be CV controlled, a major reason to add this to your AE system. This is really useful for varying sequences and melodic sounds in particular.
The sound goes from quite soft filtering with low resonance setting to a quite intense resonance peak to full self-resonance. On newer models there is a switch to change the resonance characteristics from "wild" to "tamed".
These merchants probably sell this module. Huh?