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Remove high pitch noise audacity

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Set the threshold levels before you adjust the corresponding Detect and Reject values. If the minimum RMS amplitude is -55 dB, then set Minimum Threshold to -55. For example, if audio has a maximum RMS amplitude of -10 dB, you should set Maximum Threshold to -10 dB. Determine the unique detection and rejection thresholds for the maximum, average, and minimum amplitudes of the audio.