I've been thinking about this for months. The best I've come up with is to use a voice filter, but I'm not sure it would work. If someone knows what filter you're using, could they "unfilter" it and then train on it? Can a random, subtle filter work? Transcribe the entire recording and use T2S?
Also, if a recording device is plugged into the wall (microphone up laptop then laptop to wall when) then subtle variations in the 60Hz grid frequency can get recorded. A dedicated person could use that to get your recording time and general location.
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