Case 1 : The audio icon is visible on the slide
This is easy, just select the icon representing the audio and press Delete.
Case 2 : The audio icon is not visible on the slide - hidden
If there is no icon visible that could be because it is hidden behind another object.
If that is the case look for it in the animation task pane or in the selection task pane.
In the animation pane you will recognize the audio with a blue play arrow next to it. The name of the audio file will help of course.
If you click on it you will see the number of the animation lighting up on your slide, then press delete.
You can also drag the object covering the icon away and delete the audio.
If you select the audio in the selection pane the full icon including the audio bar will appear on the foreground. Press Delete.
Case 3: The audio icon is not visible on the side - outside drawing area
If you want to see the icon to delete it use the zoom slider in the bottom right corner of the screen. Reduce the zoom and the icon will appear. Select and press Delete.
