Ron,
Just to add a bit of clarification to an important part of the puzzle. The audio connections from your sound card to your amp or speakers should most likely be: 1 mini-RCA plug for the front, 1 mini-RCA plug for the rear, and one for the subwoofer. Then you need to configure your Vegas hardware settings accordingly. Don’t try to listen to 5.1 from Vegas with a Toslink digital connection to your speakers…..it won’t work.
check ALL of your video TRACKS, and see if they are set to 100% and if the “track motion” is the way you intend for each track. Also, did you use the Color Corrector filter?
I believe your working with an alpha channel clip from Demo-Films. A much better and cleaner way is to click the event (clip) properties and select straight alpha.
That’s about as good as Youtube gets. You were wise to have a black background and not a moving stock video. You can see how Youtube handles and desecrates a video especially when you have allot of fast busy motion vs. a video which has a minimum of motion. A good example of what Youtube destroys and what looks fair can be found at my Youtube site https://www.youtube.com/user/AvantiVideo My Ozzy Osbourne video got killed whereas the Sharpies and others came out better. You can also compare my Youtube videos to the same but much higher resolution videos on my website http://www.avantibiz.com