The Vegas work-flow i am using lately is:

1) Edit in Vegas
2) Export EDL
3) Import EDL to REDCINE-X
4) Grade in REDCINE-X (much easier and more precise than using Vegas for CC)

After you are done, you can export a video from REDCINE-X that you could also use for sound editing. This will help, as doing sound editing using the R3D files in Vegas is not recommended. (Too slow and unresponsive)