Use the Windows sound controller to adjust the volume that Vegas is seeing. Most systems have a little speaker icon in the startbar area next to the time.
Track 1: Mask (Assuming WHITE on TRANSPARENT background) with track compositing mode on Multiply (Mask)
Track 2: Clip to appear in the mask set to be a child of track 1
Track 3: Clip to appear in the “Transparent” area
I do this using text in Vol 2 #5 of my newsletters.
I was just thinking that the MPEG2 preset you used might have included audio and DVDA didn’t automatically pick up the AC3 for some reason. That’s why I always double-check to make sure the AC3 is being used.