OttoPhilter is a free filter Audio Unit plugin developed by Music Unfolding. Compatible OS(s): macOS.
OttoPhilter is an auto/touch wah filter with LFO control and sub-octave generation and a second auto/touch wah filter on the sub-octave. There’s a level meter tied to the touch wah sensitivity to help you adjust OttoPhilter to suit your playing dynamics. OttoPhilter has two driven resonant filter sections – one on the input signal and one for the generated sub-octave. The filters sweep by using triggered envelopes or tracking the input signal or using LFOs.
http://www.musicunfolding.com/