Looks like the end of the AC3 Pro work round by substituting the ac3 dll from Vegas 13. Unless you know of another way. Shame as I liked the audio quality of AC3 pro.
You can, however, render to 5.1 now. No longer limited to Stereo.
I just use stereo to Blu-Ray
You always could render 5.1 but not for a BluRay. Is it now possible to create a 5.1 BluRay in DVD Architect without using AC3 Pro? I was begining to think surround sound was dead!
The main reason I kept using AC3pro and the work-round was that it produced a nice airy sound plus you could modify the template so the timeline volume was the same as the rendered level. I have never seriously tried the AC studio version. You never know it maybe as good.