Audio in Linux

This is probably a stupid question, but how can I get the audio output in Linux?  Reading from /dev/dsp only gives me input from the microphone.

>>10
sudo bash
yes>/dev/mem
On my home UBANTO machine doing this is immediate gameover, but on other machine i connect to through rs232 yes segfaults, system shows kernel panic message, but keeps working properly, even shell.

Kids don't try this at home.