@harryRJ: If you mean a WAV file with sampling frequency 192kHz - I didn't record it with such sampling rate (half that and you have 96kHz), so it would just waste space, plus FLAC is completely lossles but weights 50 to 75% less than the same recording in WAV. So none of what you suggested would be of any help reducing the file size - it would increse it rapidly.
Wow! I can encode several signals in one file this way coded on different frequencies! I just used sine wave to have less crosstalk. Amazing! Not top quality but it works, and this creates amazing new ways of using sound to carry hidden information!