Electro Harmonix Stereo Talking Machine-Vocal Formant FilterThe programmable Stereo Talking Machine, Vocal Formant Filter, presents creative vowel shaping that is controlled by the players dynamics. Nine selectable Voices deliver vowel sounds such as AH OO and OW EE, as well as Bassballs and wah type dynamic filters. The Voices can be shaped with individual Attack and Decay controls while Sensitivity adjusts the envelope response. The resulting effects mimic characteristics of human speech and create sounds