The playback volume of the computer is low or you hear no audio from the computer.
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The computer has no sound board.
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The computer has no built-in speakers or no external speakers are connected.
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The volume of the computer is turned off.
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Turn up the volume of the computer. (Refer to the instruction manual of the computer.)
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You can change the volume of WAV files and save them using the Increase Volume feature of the Microsoft Sound Recorder.