Scary Ambience from speaking test

I am still working on the speech implementation. I've got the frequencies working so there is a sine wave playing at the frequency as well as the voice. This was trial and error measuring the "cycle size" of the sine wave and the speech.
This scary sound is the 40hZ sine wave playing a second and every second it says "Second is ... ". Playing at 40hZ.
The crackling is what I am working on now. The speech is a 217 hZ voice. So we are playing it a lot slower. So any impurities in the sound are dramatically amplified. I have a few theories on how to crack that, first is to do with our a sine/cosine wave is just a 1D circle. It shouldn't a linear interpolation won't work but a circular interpolation should have more realistic sound. It might work but who knows, I'll cheat when I can.
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