Hello, I think you can take this way to try to to that.
And the reference website:http://www.ehow.com/way_5833477_can-remove-sound-powerpoint-presentation_.htmlRemoving Transition Sounds
One of the most commonly used PowerPoint presentation sounds is transition sounds -- the noises made when the presenter flips from one slide to the next. If there is a transition sound for every slide, save yourself time before you try to manually remove each one. Click the "Animations" tab and look to the right of the slide transition options. There is a "Transition Sound" option, with the selected sound next to it. Open the drop-down menu for the sounds, select [No Sound], and then click "Apply To All" down below. Now all slides will have6 no transition sounds.
Removing Action Sounds
Action sounds are sounds made when something within a slide is clicked or some animation within a slide is performed. Removing these takes a little bit longer than removing transition sounds, because they are not uniform on every slide. Under the Animations tab, click "Custom Animation" on the left side of the tool bar. A sidebar will open on the right of your screen with all animations and sounds which are set to occur on that slide. Select any sounds you want to remove, and click the "Remove" button above the list. If you have several sounds to remove on a slide, hold down the "Ctrl" key and select multiple sounds at once to remove.
Removing Audio Clips
Usually, audio clips are set to play when the user clicks on the audio icon, meaning that you can just delete the icon or avoid clicking it if you don't want the clip to play. If an audio clip or song is set to automatically play when a slide is opened, it should also appear in the "Custom Animation" area and can be removed just as action sounds are removed.
Removing Video Sound
If you want a video to play in a PowerPoint but don't want to hear the audio associated with the video, click on the box where the video appears in your slide show, and then click the "Options" tab which appears under "Movie Tools" on that slide. Under Options, click "Slide Show Volume" on the left of the toolbar, and you can select to mute that particular movie. You have to repeat this action if you want to mute any other movies in your presentation. Answered Apr, 02 2011