Hi Elmo -
I appreciate the prompt reply. What I meant was that AUM must be configured when a new source is defined. It presents a list of available plugins (in this case IAA). SLM appears in that list with a number of possibilities including Recording1 and Pitch. I selected each option in turn, but in all cases AUM can’t instantiate SLM. The available “reload” option doesn’t work either, nor does instantiating SLM manually and then reloading, which AUM suggests as a last resort. All my other IAA plugins (virtual instruments, FX etc.) load successfully. That’s the issue; I hope I’ve explained it better.
Old audio engine is indeed off.