Fix macOS build

[jmechnich]

With these changes I managed to compile natively for Apple Silicon. The build environment is:

• MacBook Air M1
• macOS 11.6
• Xcode 13.0

The previous AU type 'CtrlrAU' did not seem to work at all and led to a mysterious error from the resource compiler Rez. I have chosen to use the default kAudioUnitType_MIDIProcessor (aumi) which seems to fit well.

The standalone version seems to work very well using the OB-6 panel. Using the AU as a MIDI FX in an external MIDI track in Logic Pro generally works but there still seem to be a few bugs to be ironed out (or I haven't figured out how to configure it properly).

[dobo365]

Congrats Jörg!
So, we will have the possibility to create native M1 standalone versions of our panels?
I guess it is mandatory to have an M1 Mac to generate them and that I cannot simulate that with a VM. Correct?

[jmechnich]

Congrats Jörg! So, we will have the possibility to create native M1 standalone versions of our panels? I guess it is mandatory to have an M1 Mac to generate them and that I cannot simulate that with a VM. Correct?

This only means that the application and AU are available in native format:

$ file /Applications/Ctrlr.app/Contents/MacOS/Ctrlr
/Applications/Ctrlr.app/Contents/MacOS/Ctrlr: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64] [arm64]
/Applications/Ctrlr.app/Contents/MacOS/Ctrlr (for architecture x86_64):	Mach-O 64-bit executable x86_64
/Applications/Ctrlr.app/Contents/MacOS/Ctrlr (for architecture arm64):	Mach-O 64-bit executable arm64

The panels themselves are independent of architecture (as far as I know) but I am not an expert...maybe there are exceptions.