Sound only works on the Gamecube version for now, and isn't perfected yet. There are still some games that lack any sound such as Mario Sunshine, Luigi's Mansion, and Zelda: Twilight Princess (Wii).
Give it a while and they'll probably manage to get sound working for these games in addition to improving overall DSP emulation.
Give it a while and they'll probably manage to get sound working for these games in addition to improving overall DSP emulation.
