I connected the Raspberry to my tv via HDMI cable but no sound came out, i tried to install libraries: sudo apt-get install alsa-utils sudo apt-get install mpg321 sudo apt-get install lame
and loaded the driver: sudo modprobe snd_bcm2835
and executed the following command: sudo amixer cset numid=3 2
In the instructions it says that if you are using HDMI choose "2".
When I executed the command it just says: amixer: Control default open error: No such file or directory