3 and 4 player Split Screen audio bug.

Character voices and battle sounds are extremely quiet compared to menu and item pickup sounds in 3 or 4 player split screen. You can't simply turn up "SFX" because then the item box and menu sounds become insanely loud by comparison. I believe this is a bug where the voice scaling is somehow off. It would be nice if we could independently slide voice volume as well, but as long as they scaled in sync with other SFX that would be a sufficient fix.