I agree edwin, the SF-2 certainly is a versatile tool. I have been experimenting pretty substantially, and found that with the SF-2 in stereo going through the R and L channels respectively I can really hone in the coloration I like. I also need the Navigator due to the sheer amount of effects I use (which I run in the side-chain, so I can dial in as much or as little wet signal in parallel as I wish). Thirdly, it is beneficial for me to use the balanced XLR's on the Eden to run my Powersoft power amp (1.32v input sensitivity @ 8ohm), and I also have the summed Main DI to send to the FOH for a nice round total of the effects units.
Funny enough, the only shaping I do with the Navi EQ is turn the 'Bass' control down a notch as the center frequency is 30Hz so I get a slight cutoff, working like a HPF.
I really wish the Alembic pre's had more options as far as loops and outputs are concerned... but using the SF-2 as a stand-alone unit that I run clean with no effects is an irresistible prospect as well. May the experimenting continue...