*solved* Hey everyone! Thanks for all of your replies! You led me to the right place. I found the IAC driver too buggy to be usable, but I took the external instrument approach and I’m now controlling Kontact as a stand-alone application through the “Kontact 5 Virtual Input”. I create a new external instrument for each patch, add Chord Trigger, and then send to Kontact. It works perfectly! Mainstage loads up 30-40X faster and loads of memory and CPU have been freed up. Thanks again!