have you checked the mixer settings!!
my initial problem when setting up my sound was because the mixer levels were all at zero.
turn up the Master Volume and also PCM/Wave level and then play your wav file again..
the reason is that you can sndconfig all you like and it will detect your card. mixer levels are 100% crucial when testing the sound
you shOuld hear "hello this is linus torvalds and i pronounce linux as linux" in sndconfig