VSDC No audio when editing tracks?
Open your Projects Explorer Panel and Properties Panel
Click on the Project that you are working on 
Make sure that the Audio settings for the project is set to Mono or Stero


I have been struggling with this for a day now and just stumbled across my own mistake. When I initially started the project I set the sound to "No Audio." I did not want the sound in the videos that I was merging. 

VSDC gives you independent control over video audio in each of the property windows of the specific video. The Project audio settings is a global sound control. Of course, if you set it to No Audio that's exactly what you get.