For me, QuickMIDI has been a really useful little app in the App Store. It sits in the taskbar and allows MIDI keyboards to play directly in the OS without any other audio apps being open. Since OS 10.12, the app crashes upon launch on my M1 Mac mini. I had reached out to the developer, and he reworked his code, but the app still crashes. I the developer my crash logs and apparently the crash is coming from a bug in the SDK Development kit. I wrote to Apple about it, but haven't heard anything back. I was wondering if anyone else has this app and whether it's working for you.