This is a document I worked awhile on but never quite finished. Though I never completed it I thought it was a shame to put all that work into it and not put it out there. It has to do with how th post FX aren't exactly parallel and why and what the signal path actually is depending on what you do. It was pretty much done but needed a major editing job since it is a bit wordy. You'll see what I mean. Stick with it, it should answer any questions you may have had about the post FX routings.