I added this to the Top Post "Theory of Operation" section:
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The sample rate is 8000 samples per second, which means that if you call one play of the 1024-byte sound buffer a "beat", then this program plays 256 beats of almost 8 beats per second. Each beat plays at a different sound volume, creating the "semi-percussive" sound. Changing the "350" multiplier changes both the depth of distortion and the perceived repetition rate of the slowly varying distortion pattern. This perceived repetition is an audio interference pattern similar in nature to the visual interference (moire) patterns in some of my eink animation demos.
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