I just bought a new(er) iMac with OS Sierra. I have an Edirol PCR-300 MIDI keyboard controller that I was using with my old computer to make music, but now I've found out that the company is no longer updating the drivers for the keyboard, so it won't work with Sierra. However, I did find a note somewhere in the ReadMe files for the keyboard that says if you're trying to use it on an os that isn't supported you can use the os's built-in midi driver instead. Is that what the IAC driver is for the Mac? I read some pages about using the IAC driver but I can't get it to work and I don't know if I'm even pursuing something that's possible. If anyone knows anything about this or could point me in the right direction that would be greatly appreciated!