That is sound advice CaptDan, thank you! I kind of stumbled into that realization during the last month and a half of trying various routing options, many at the hands of (the gruff, seemingly uncaring, condescention of) various Tascam tech reps who would whisk me through various set ups, none of which worked, all of which they would blame their inability to resolve on a clock issue or DP. Followed by a couple MOTU reps who were helpful enough but didn't know the working of the DM4800 and therefore claimed it probably didn't support the platform, even though I pointed out that MC for DP was right in the menu along side a myriad of other platforms.
Unfortunately my lack of knowledge goes beyond not knowing what routing to use for my inputs and outputs with the 4800 - it's that I don't understand the signal path enough to know what controls what and in what order. In my old Mackie d8b (God rest it's soul) I was able to record all my automation and use of effects right in the board but could not use it as a full control surface for DP, which I had gotten used to and enjoyed- even as cumbersome as it was. But with this current set up I'd like to use the board as a control surface and learn the depth of technology that is available to me to fully utilize the capabilites of the 4800.