You have everything you need when you download the Dolphin emulator, you may need to adjust a couple of options to suit your need. You will need a decent PC though.
My audio settings are: DSP HLE emulation (fast) ENABLE DTK music (ticked) ENABLE AUDIO THROTTLE (ticked) Audio Backend (D SOUND) Sample Rate 48000 HZ
Odd, I downloaded the emulator with a rom with a torrent ... Well, maybe they don't include it at the official website.