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Nolan,i think the dry signal in the intellifex stays analog,it isn't digitized ) Cool, then it's great candidate for making life easy and chain through it after the MP1 and keep stereo
. So best back end of your patch MP1 A/B out > IFx L/R in IFx L/R out > power amp L/R in, mix the amount of effect with mix (wet/dry) in IFx, change its program (different effects/mix settings or bypass) via midi (use MP1 midi through or midi out into IFx midi in).
I couldn't find a dcr1 on google, is it like MJMPs dcr2 (i.e. a rack wah)? I take it it does line level out if your coming in the MP1 rear input (as it's a line level input).
Depending whether you want to distort the wah (before MP1) or wah the distorted MP1 signal (MP1 loop) are the two options.
If you want to put it before the MP1, I'd go with inst level settings and go into the MP1 front input (or do the mod with makes the rear input the same as front for guit/inst level as may be easier with you rack/patch?), otherwise you increase the gain via the dcr1 (guitar millivolts to line level ~volts) and then the MP1 will drop them back again to millivolts for the tube/SS circuits (MJMP correct me if I'm wrong), which is not good gain structure (unless you are running really long guitar cables ?).
If it runs comfortably at line level (in/out), then the loop may be a better place for it (you can switch it in an out on different patches) and plug your guitar in the front input. But try both (all 3 i.e. rear input as well) and see how it sounds, the big bonus will be stereo Fx with the IFx after the MP1.