Hi Mitch. I have been experimenting a little bit with the Doepfer A119 and Strymon A.A.1 as input/output/effects loop modules. I also have several effects pedals, modules, and filters that have been fun to incorporate, but I haven't done much recording of the outcome yet.
As far as adding rhythm to your guitar stuff, you would likely be best served with a nice external drum machine like the Roland TR8S. The cost/benefit/usability ratio is very high with that one. Check out some demo videos.