Hello,
I’m using this way… I’ll let the Midex drivers load in Yosemite where they work without any problem, then I restart into the El Capitan or Sierra system, which I have on other drives, where the Midex drivers will remain functional throughout the system work. In Cubase 8.5 they run all the time without any problems, but in Logic Pro X 10.3.1, unfortunately after some time they start to hang tones on HW synths, or some of the HW tools do not work at all after midi, and some of them do, the operation of the master keyboard even though Cubase is all right.
Try, write, thanks…
r.