Sound works, 5.1 doesn't

[Reykor]

Hello guys, so I've just installed Mountain Lion on my hackintosh, which has a GA-Z68X-UD3H-B3 motherboard.

Everything is working, except the 5.1 sound. I'm using a an analogic 5.1 speakers, which work in Windows, but don't seem to work in OSX Mountain Lion, because I can't get any sound.

I can, however, get sound by connecting my headphones to the headphone jack.

Any suggestions?