Create 'tăng lực' sound:audacity:- create→add new→mono track. - generate→chirpwaveform: square• startfrequency (hz): 1000amplitude (1-0) : 0. 8. • endfrequency (hz): 3000amplitude (1-0) : 0. 3interpolation: linearduration: 0. 100s. - effect→repeatnumber of repeats to add: 2.
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