Originally Posted By: Russ
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One aspect to these tests that is missed is modulation of the whistles/tones. The sound may need to overcome background noises in the same frequency (like my tinnitus) and one way to do that might be to modulate the tones.


That might explain why the pea whistles did so much better than I expected too.
In the same vein, does anybody have an idea if the Fox Pearl is enough different but still close enough on its two frequencies to form a beat frequency between them?
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