Built me a DIY talk box for electric guitar (ala Frampton, Joe Walsh, etc) but not terribly thrilled with it. Got to wondering about how to lose the tube that has to insert into mouth, and thought, is it possible to design a circuit that could reasonably mimic one? A Wah Wah pedal could be used to still affect the signal but in a way that the range of it could alter the sound more like a talk box sound. I know that it's pretty much impossible to get a sound and response to the depth of the human mouth, but I still wonder...anyone?