I'm working on VOIP over Tor. Although I haven't yet decided what apps to use, there's an additional concern: voice recognition. I've found Vocoder, which is a vocoder app for Linux. As I understand it, vocoders separate the voice carrier (the tone producer by your vocal cords) from the signal (the modulation added by your tongue, teeth, lips, etc). They use the signal to modulate some other carrier, such as a guitar or other instrument, or just the output of an oscillator. Given that it's the carrier that makes your voice unique, it seems like vocoders might be enough to disguise your voice. But is that really true? Comments, please.