How to use dx9 plugin,twilight princess sound and controls

[fmurph]

I just started using dolphin to play the wii version of the twilight princess. I am getting about 22 fps on an amd athlon 64 x2 3ghz and an 8800gt. I read that using the dx9 plugin would speed up the game, but dolphin is not giving me the option to switch to dx9. Also, some of the music in this game does not work, and I was wondering if this was something that is happening to everyone. The music in this game that does work speeds up and down according to the frame rate and I was wondering if there was any way to force it to play back at a constant speed. Also, how do I swing link's sword?