WebFree Online Pitch Shifter. This app changes the song pitch and/or playback speed using one of the best pitch shifting algorithms. The musical key, scale, and bpm will be … WebMay 2, 2013 · They cause high-pitched, high frequency noise in the range of roughly 17.5 kHz and up, limiting its influence to mostly teenagers. Several manufacturers exist …
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Using ultrasonic & audible sound to quiet your neighbor
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