Using dyne:bolic 1.4.1 my soundcard is correctly detected but I get no sound when playing something.

start fx xmms and let it play a song. This xterm command will do that:

xmms somesong.mp3 &

or type one of the following lines:

cat /dev/urandom > /dev/dsp
cat /dev/urandom > /dev/sound/dsp
(will produce noise)

In the xterm then write:

alsamixer

here you can with the left/right arrow on the keyboard choose different output possibilities. With uparrow turn up one after the other each output until you get which output the card is using. When the correct one is found - turn down the others. (for me the correct one was DAC)