#setting up audio config for Retropie
brew install pulseaudio

#Start the pulse audio daemon
pulseaudio --load=module-native-protocol-tcp --exit-idle-time=-1 --daemon

Script will pull docker image and start a vnc server in the container pointed at http://localhost:6081/ Run the following...

./setup.sh

navigate to http://localhost:6081

Once you see glxgears working, run the following in a new terminal process.

./emulationStation.sh

If sound is not working change in the sound settings in emulation station.

audio card = DEFAULT audio device = MASTER