You can run Audio Repeater in background while playing a game. All you have to do is right-click on the main window and then select "Minimize to System Tray" option. After that, minimizing the Audio Repeater will send it to the system tray. ( Before minimizing, make sure to close all the plugin windows. It will help to reduce the CPU usage! )
By right-clicking on the tray icon, you can start or stop the streaming process without going into the main window.
The tooltip of the tray icon displays the currently selected input and output device. It also shows the current state of the repeater.
How to run Audio Repeater in the background?