Nada. I have finally reached the place where the AXE does it all for me, and I really don't need or want any extra pieces of gear in my signal chain. (Raising my glass to the new VC and pitch block!)
It's great. No extra noise, patch cables, batteries, weight or size - and I still have every bit of function I ever wanted.
I am wireless, so it's just me and my guitar with a transmitter - free to roam. On the XL, I had my wireless routed to the front, but on the III I now have it wired to the rear so my setup is ultimately clean.
The FreqOut is now the only thing I might ever want to put in a loop, but I have found a couple of virtual feedback generators for the AXE that do a pretty nice job, so I'm good.