Kancolle crew voice removes background music from login screen and from games, found this out by installing mod, finding said issue, uninstalling mad, issue fixed, then reinstalling mod to confirm that said issue is created by the selected mod.
The mod "Training Room Enabler" does not work with current WOWS build 0.5.1.4. Got error at login screen, went and disabled and enabled sets of mods, found the mod that I currently have enabled that did not work.