Soul Calibur 2 sound skipping

[Ivoryhammer]

I've ran the emulator on the recommended settings found on the wikipedia page, but no matter what I do the sound keeps skipping in battle, in the menus it's fine, but as soon as the battle starts the voices and BGM just mess up, other than that the game runs perfectly, no lagging or any other graphical issues. I'm using the NSTC version, running Windows 7 with a Radeon 7700 graphics card, an Intel Quadcore Q6600 processor and a Creative X-FI sound card. I'm using Dolphin 3.5-1335. Any help would be greatly appreciated.