I am using Vegas 13 290 built and I am trying to export a 4K video file with surround sound and nothing works. XVAC S for example only exports in stereo. I also use FCPX and it is pretty simple to export both video in 4K and surround sound in h264 or pro res. My mac though is old and I prefer using my pc. So does any one knows how to export 4K video and surround sound in one file?