Project is losing sound when minimized/losing focus.

Hello everyone,

I’ve a UDK/UE3 project, when I run the project. If I minimize or lose focus of the window. The game sound get’s cut off.
I know there’s a few fixes in UE4 for this by changing the Engine.ini and adding the following line:

However, I’m not sure how to solve this on a UE3 without re-doing the whole project.

Any help is appreciated, thank you in advance for your time.