Remember that if your AUD mics are significantly far back from the stage that you will need to add a delay to the SBD track (or slip it in your editor) -- otherwise you may hear an audible delay/echo/phasing. It's easy to think that both stereo files will be in sync cause you used an R4, but that's not true if you're way back with your AUD pair. The good news is the two sources won't drift once you have them synced. For really small clubs, this might not be an issue, but for bigger venues when you run your mics back at the board, this is a must-make adjustment in post.