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OttoPhormant is a wah effect based on morphing formant filters. It can be controlled using touch-triggered sweeps or envelope tracking. The filters can also be controlled using MIDI expression control.
There are 10 formant or vowel types available. The effect works by selecting three vowel sounds - start, middle and end - and morphing from one vowel to the next. There are 10 possible vowels that can be used in each of the three locations.
The formants are created by three filters. The filters can be either bandpass or a combination of two bandpass and one lowpass. The bandpass settings are similar to a traditional wah pedal. The filters are a special combination of Music Unfolding's multi-stage driven filter. You can choose from 1, 2, 3, and 4 stage filters. You also have control of the resonance and drive for the filters. There's a lot of control for setting up just how you want this effect to talk to you.