Finally, after many tries and much learning, two clearly working JACK servers, cooperating, on one motherboard: https://github.com/jebofponderworthy/MultiJACK/blob/master/README.md Stéphane Letz did point out quite a while ago that the design goal (getting more JACK DSP power out of one motherboard) probably would be served by use and addition of the loopback driver to a single-JACK configuration.  I didn't understand it then, but do now, and will be testing this first on the next major iteration of my synth platform: https://lsn.ponderworthy.com -- /Jonathan E. Brickmanjeb(a)ponderworthy.com <http://login.jsp/?at=02e47df3-a9af-4cd9-b951-1a06d255b48f&mailto=jeb@ponderworthy.com>   (785)233-9977/ /Hear us at http://ponderworthy.com -- CDs and MP3s now available! <http://ponderworthy.com/ad-astra/ad-astra.html>/ /Music of compassion; fire, and life!!!/