No sound in MacOS8

[kurbanowski]

Hi, I followed the instruction for installing MacOS8 with MacintoshPi on my R Pi 3B. Everything runs amazing but there is no sound available. I tested the raspberry with speaker-test and it works properly but after launching the macos the sound is gone.
I tried accessing Monitors & Sound in Control Panels but I get an error:
This computer does not support Monitors & Sound. Use Monitors control panel and Sound control panel on this computer.
I also tested OS9 and there is no sound either.

Any help would be appreciated.