Thanks Marci and all of you who took time to help me. I discovered that for whatever reason, if my aggregate device uses the 1&2 inputs on the MOTU (in this unit an UltraLiteMk3, Mic 1 and Mic 2) then I can get my synth into sound level watcher. I was hoping to use the MOTU as a mini-mixer and have several inputs active. Not saying it can't be accomplished, just that I haven't had the time to get beyond my immediate needs.
Best to all, John