I don't run effects, but I use the mono out to the power amp, and send the A & B outs through a Radial JDI to the FOH. Has worked very well so far. I get post EQ to the FOH and he's happy with the signal clarity and level.
Before running this set up, I conversed with Alembic. There's no problem with running all 3 outs at the same time, you just may notice a drop in volume. I have not.
Based on what I've heard (beware, most of it I don't fully understand), to get the full output from the F2B, be sure that the input impedance of whatever the F2B is feeding is at least 10K ohms.
FWIW.....my $.02
C-Ya.........wayne