Custom sounds (see warning) 
WARNING
In fact, for custom sounds you need to own BRMK. After 1.2, Fluppi made some sound-related changes to the engine. That's why you can't include custom sound in game. I'm working to fix that.
- Open in Content Browser 
/RSL/Soundsfolder - Move your 
.wavfile in Content Browser - Open this asset in Unreal Enigne and change in 
Vizualization ModefromDisableorRestarttoPlay when Silent