Actually there is. In Config/FrameLimit you can select Audio. So I suppose you have choosen "Auto". Try "Off" or better choice you could try with Dolphin 3.0 and use the Audio Throttle option (in DSP)
[color=#ff0000][color=#006600]i5 3570K @ 4.5GHz/GTX 660 Ti/RAM 4GB/Win7 x64[/color][/color]
