Someone posted this on another BBS. They claim it works quite well. Hopefully, I'll have time to try it out this week.
1) Perform internal mixdown.
2) Set Chan 1 to Aux 1, PRE fader
3) Set Chan 2 to Aux 2, PRE fader
4) Route Aux 1 to Stereo left of effects chain, route Aux 2 to Stereo right of...