Audio not working on Arch Linux

I've installed the alsa-utils package. Running amixer sset Master unmute returns the error amixer: Unable to find simple control 'Master',0.

Executing alsamixer gives me the alsamixer application in the teriminal emulator, but <- and -> do nothing; I can only use m on an item listed as S/PDIF.

beep works in the console, but no other audio works.

Any help greatly appreciated.