I am trying to add my own sounds, for my drops, and I tried converting it, but I always get: ERROR: during encoding Call of Duty World at War/sound_assets/raw/sounds/bonus.wav. Bad file format.  I have tried changing the hz of the file in audacity, but still the same error. I converted some music, and that went through perfect, but this sound, which I really need, won't let me convert. I copied the soundaliases from the songs, and it still doesn't work. What am I doing wrong?