It depends on how you want to run it. Do you mean running the eleven rack in 4 cable method? It works. Sort of. I actually just gave up trying to set it up this way because of the parallel loop and the eleven rack didn't seem to get along so good. The other gotcha is that when run in 4 cable method the eleven rack fx send doesn't ever stop sending. Even if you turn the the eleven racks effects loop off it only stops the return signal when it's off. So you can't really use the amp sims with cause you end up stacking preamps and IMHO that sounds um bad m'kay. Head on over to the DUC forum and elevenrackpresets.com I found lots of threads about running it in 4 cable method.
If you want to just run in into the effects return this is where I feel the 11r really shines. I started just doing it this way. Personally run like this the 11r rectifier sim out rectifiers my rectifier. If that makes any sense. Blasphemy I thought at first. But that's just me YMMV
In the end I just picked up a bunch of cheapo pedals to get effects cause the hassle just wasn't worth it anymore. Still have the 11r and a pod hd500 they are great for other things like when I need to play quiet at night. Like right now.
And yes the fx loop button on the rectifier footswitch turns on and off the fx loop of the rectifier.
