This turned out to be the best solution. The issue I was having, where things were being triggered that I didn't expect, was due to a self inflicted situation of not setting the global midi channel on the Oxygen 61. Once I figured that out and found the _right_ way to change that parameter, things started working properly and as expected. So far I have been able to create 4 combinators with various instruments and configure them to be triggered on incremental midi channels and busses. I believe that at this point I have gotten through the proof of concept part of this and feel comfortable laying down the $ for the software license.
I never could get the split and octaves thing to work. Perhaps it is my controllers. But thanks Hollow for trying to help me.
Thanks to gwoo for providing the working solution and I can't wait to get this 'thing' out on a stage and take a test drive.