I researched on how to add sound and found two websites, since Edge cannot import sounds yet.
The two websites were http://buzz.jaysalvat.com/ and http://www.edgedocks.com/edgecommons.
In the end, I decided to use Edge Commons after watching a few tutorials. However, I faced a problem when doing halfway. I notice that after I added my background music and when I start adding my voice over to each scenes, My bg music automatically stops when I clicked on the next button. (Although I only put a stop to the previous scene's voice over and did not stop the bg music)
I tried splitting my bg music into different clips to be put into each scene, but it feels weird when played because everyone might press the next button at a different timing.
So in the end, I ended up removing all my stop codes for each previous voice over. At least now my bg music will be continuous throughout the whole story. However, now that I have remove the stop codings for my previous scene's voice over, user will have to wait till the narration/voice over is done before pressing the next scene button. (or else there will be multiple voices talking since the previous scene's narration is not done yet).
I also realize when I tested it on my computer, that Edge Commons takes time for the sound to load, so I need to wait for a while before I click my 'Play button' or else there will be no sound.
