Every time a car goes by you hear the doppler Effect which is

the change of wave frequency recorded by the recipient. The frequency starts out at

a high pitch and it lowers as the car passes you. The sound reaches you as a higher

frequency because each wave compressed by the car moving forward and the opposite

happens as the car passes by. ( for more information click here ... )

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1. To create a Doppler shift Effect open your sound in Edit view and select an audio range.