If you are feeling adventurous, you can make Sound Control work on Mojave just like it does on High Sierra, including Audio Routing, by doing the following:
1. Disable System Integrity Protection
Please do not disable System Integrity Protection unless you know what you are doing.
2. Remove /Library/Audio/PlugIns/HAL/STZSoundBridge.driver
4. System Integrity Protection must remain disabled.
All of Sound Control's features will work just like they do on High Sierra, including audio routing.