is that with all games?
I am getting no sound from Four Swords Adventures and the Wind Waker
im using win xp 64
i also have that integrated realtek audio
It depends on the game, actually. I've had SSBM give me full sound (yes, even music) but Mario Kart DD has none whatsoever. Pokémon Colosseum seems to spout undertones to the music that ought to be playing.
Sound doesn't work on most first party Nintendo titles and some third party titles, a couple of these games being Windwaker and Mario Sunshine.
Problem is there is little to no documentation on the sound format/system Nintendo uses.
You can either wait for a future release of Dolphin that addresses this problem or an immediate fix would be to pop these games into your Gamecube to play them flawlessly with sound and no bugs/glitches.
Is there even any sound on Dolphin? Maybe I'm a little bit outdated, but last what I read was that the plugins did exist but sound didn't work at all on Dolphin...