[RMMV] NEED A DEVELOPER TO HELP DIAGNOSE A PROBLEM WITH CODE (PAID)

Hi, i need a developer familiar with javascript to help me figure out whats wrong with this rpg maker mv to android client apk maker. What's happening is the BGM isn't work although bgs, me, and se work fine. I think it has something to do with the apk maker still using Crosswalk which is no longer supported on the android version that this apk maker uses, but the code is still in one of the files. I'm not sure but there is a descrpency between webview client and the crosswalk code, that may be the cause of the audio BGM not to work, i can deploy it though, it works fine on android just No BGM. So here's the deal you figure out what code below needs tweaking, to get BGM to work, and I'll happily pay you to assist.

AltimitSystems/mv-android-client