Manual Build and Install

Install the virtual audio device Background Music Device.driver to /Library/Audio/Plug-Ins/HAL.

sudo xcodebuild -project BGMDriver/BGMDriver.xcodeproj \
                -target "Background Music Device" \
                RUN_CLANG_STATIC_ANALYZER=0 \
                DSTROOT="/" \
                install

Install the XPC helper.

sudo xcodebuild -project BGMApp/BGMApp.xcodeproj \
                -target BGMXPCHelper \
                RUN_CLANG_STATIC_ANALYZER=0 \
                DSTROOT="/" \
                INSTALL_PATH="$(BGMApp/BGMXPCHelper/safe_install_dir.sh)" \
                install

Install Background Music.app to /Applications (or wherever).

xcodebuild -project BGMApp/BGMApp.xcodeproj \
           -target "Background Music" \
           RUN_CLANG_STATIC_ANALYZER=0 \
           DSTROOT="/" \
           install

Restart coreaudiod:
(Audio will stop working until the next step, so you might want to pause any running audio apps.)
```
sudo launchctl kill -15 system/com.apple.audio.coreaudiod
```
or, if that fails
```
sudo killall coreaudiod
```
Run Background Music.app.