, click the Audio button on the Insert tab. Choose one of the options to add the sound - From File or Record Mic.
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Inserting Audio
Choose the From File option.
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Locate an audio file on your device, select it and click the Open button.
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After the audio file is uploaded, a loudspeaker icon will appear on the slide.
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Recording New Audio
Choose the Record Mic option. , use a good mic and set it up in accordance with the iSpring Microphone Setup Wizard.
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Click Start Record to start recording.
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For convenience, you can add the text for recording by clicking on the Narration Script icon.
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Click on the Cancel icon to start a new recording and cancel the current one.
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Click Done to save and insert the audio. 
After the audio is recorded and uploaded, a loudspeaker icon will appear on the slide.
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