It seems one of the latest revs got the sound emulation in WW a bit less accurate. Some of the music gets chopped off and some sound effects don't play or something...I tried 4415 now and te sound's fine there, so it has to be some later rev that changed something in a negative way...
Intel i5-4690k (Devil's Canyon) @ 3.5 GHz (+Scythe Mugen) / Gainward GTX 1070 Phoenix (OC'd) / ASUS Z97 PRO GAMER / 16GB G.Skill DDR3-2400 CL10 TridentX / X-Fi XtremeMusic / Win10 Pro 64bit / Dell S2716DG Monitor / 3x original WiiMote+MotionPlus+Nunchuk