Since I wrote those comments I got an Octatrack. I am using the PM stereo loop to attach the Octatrack. Ultimately I don't think I will stay with this setup. The levels are really wrong. I think the OT needs a dedicated "line level" interface, and I plan to try using my Strymon pedal interface. For Stereo mixing I'm running my stereo sources through my Befaco ST Mix, and into the PM input 7. But as you said, you lose the per voice effects levels that way. You get far less versatility out of your effects modules.