(Basic) Help Setting Up EDP

[Jeff Shirkey <jcshirke@frontier.com>]

I just scored a really great deal on a used, but like-new EDP+. It'll  
arrive in a couple days, and I'm sitting here pondering how I'd like  
to incorporate it into my little studio rig that I'm building. I could  
use a little help/advice.
I'm planning on getting an Axe Fx II, and I'd put the EDP in its fx  
loop.  The Axe would be connected to my MOTU interface, along with  
other devices--like a Boss DR-880 rhythm/bass machine. My studio  
monitors are connected to the MOTU's main outputs.
Here's the gist of my question, I guess. If I want to be able to loop  
more than just my guitar--in other words, let's say I want to add  
other instrumentation (like from the Boss DR-880, or maybe even some  
VI tracks/loops on my Macbook (I have Live and Logic on my Mac)--how  
would I go about getting those sounds into the EDP? Is my solution to  
get a mixer? I'm trying to envision how my signal would be routed, and  
that's where I'm getting stuck.
A more expensive option could be to get a SoundSculpture Switchblade  
8B, in order to route all of my signals, I suppose, but funds are  
rather limited at the moment, and if I don't have to go that route, I  
won't.
I suppose I could also incorporate my RC-50 into the mix to add even  
more looping options, but maybe that's adding more complexity than  
needed.
Any suggestions would be appreciated.

Thanks,

Jeff