I have experimented with external summing a couple of times, but I find that the way I tend to group things doesn't mesh well with external summing.
How do you do it, those of you who use such things?
I typically have busses set up ITB for drums, guitars, bass, vocals, and effects, then I have all those busses routed into a master buss, with some compression, etc. I'd like to integrate my 1084 clones on the master buss, just for a little extra vibe, but I'm thinking just inserting them on the master buss may be the better option, rather than using my external summing buss (home-built, (24x2, 8 stereo busses and 8 mono channels)!)
How do you make external summing work with your workflow?