Mute/remove audio from screen recording?

I'm probably too late to help Ryan but others that may encounter this, here is a workaround to avoid having to re-record the screen cast.

There are two options depending on your requirements.

1. Remove all audio
   1. Go to the slide that has the video on it
   2. Click on the video in the timeline
   3. From the Ribbon click 'Edit Video'
   4. This brings up the edit video window
   5. Click 'Volume'
   6. A volume slider appears, drag it down to -100
   7. You should now have no audio in the published video.
2. Remove All Audio - Replace Voice Over
   1. From the Story View click 'Record Screen'
   2. Click the screencast you wish to edit
   3. The Insert Slides window opens
   4. Right Click on the image of the screencast
   5. Choose 'Export Movie'
   6. This exports the movie to MP4
   7. Record the Voice over
   8. Bring the voice over file and the MP4 into a video editing program
   9. Sync the audio to the video
   10. Mute the original audio on the video
   11. Export the MP4 and replace the video on you timeline with the newly imported video.

I hope this helps someone. Instructions are for Storyline 1.