SPDIF here too. I'll output each track to it in the mixing session for a while so I can hear how it affects my mix and make adjustments accordingly. But, when I make the bounce I won't include it yet, because during mastering I use a few other plug-ins on the master buss and I never have enough computer power to run all the track plug-ins AND mastering plug-ins...so after bouncing, I'll load all the stereo files into a new session and then use the Finalizer, along with a few more plugs.