Cannot get a Multi-Output device to function at all. I'm trying to get audio out of an interface and built-in simultaneously, prior to Sierra I could do it but that might not be the issue. There was an extension I installed called iShowU for routing audio to different programs, and that removed the Multi-Output device I had setup and I didn't try to make another one until now. I've uninstalled the extension but still have the problem. I'll create a Multi-Output device, and Configure Speakers will open a window only if there is 1 device ticked, if there are 2 devices ticked it crashes instantly upon clicking Configure Speakers. Any ideas? Thanks
On a mid-2012 13" MBP running 10.12.6
On a mid-2012 13" MBP running 10.12.6