Decided to emulate to give this game a gander and having audio issues. Sounds that should come from the right are coming from the left instead, and vice versa. I tested other games in Dolphin and BfBB is the only one having this issue. After googling I found only a couple reports of this problem that were either ignored or unsolved. There isn't an obvious fix I can see in the Dolphin/game settings.

this is an issue with the game's GameCube port itself, not an emulation issue, so they never 'fixed' it since it's actually being emulated completely accurately.