Hey Luke, MikeB uses the ART Split mix in his rig. They work well but you get some level drop as it's a passive device. If you search through my posts (and/or MikeBs) (profile > Show Posts) we posted quite a bit about it IIRC.
It takes a few reads of the specs to get your head around it. You'll need a bunch of insert leads TRS (stereo jack) > 2 x TS (mono) jacks.
All the split mix in/outs are stereo (TRS (Tip, Ring, Sleeve)).
It has a Splitter bus and a Mixer bus, the first TRS jacks on each bus are the "main" input/output (http://artproaudio.com/mixers/product/splitmix4/)
So to patch your Intellifex (BTW run Intelliflex full wet):
MP1 out A/B >
(2 x TS > TRS) Splitter Input
Splitter output (pick one of them, lets use #4) >
(TRS > 2 x TS) InFX L/R in
InFX L/R out >
(2 x TS > TRS) > Mixer Input (pick one, note: it can't be #4) lets use #3 (vol pot for #3 is now InFX level)
Mixer Output >
(TRS > 2 x TS) poweramp
Mike will correct this if I'm wrong (it's been a while
) I think you also need to turn up one of the unused vols to get the MP1 dry signal (Splitter Input) to the Mixer Output (say #1 or #2 in this example) as the Splitter outputs directly link internally to their corresponding Mixer inputs when no jack is plugged into either of them.
You can put the BBE between the mixer and the poweramp if you
really want to use it (consensus here IIRC is why use a BBE
, I've never used one).
You'll probably need to turn the MP1 output up a bit due to level drop in Splitmix.