AudioKit: AKMidiInstrument crashes on init after upgrading to xcode 11

问题

Crash happens even on demo project SequencerDemo.

the line:

var bassDrum = AKSynthKick()

gets:

Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)

Happens with every instance of AKMidiInstrument

来源：https://stackoverflow.com/questions/58521803/audiokit-akmidiinstrument-crashes-on-init-after-upgrading-to-xcode-11