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...VoIP system, as far as I know): - voice disguise/modulation. Think about how many customers you'd get with a module that sounds like they're Mickey Mouse. You think: 'That's really stupid!' but then look at how many people pay for Usher ringtones. Look at how many crazy truckers buy CB microphones with reverb. - voice stress analysis. If you're dumping the audio through a filter, there's no reason you can't simply extract data from it instead of alter the audio path. A one-way background audio carrier tone to the listener might change pitch during stre...