No sound with iceweasel+linux+debian (etch)

[mrtabs]

Hi all,

I'm having problem with my flash application running with iceweasel browser (firefox) in a linux debian (etch release). There is no sound!
I tried to run some youtube videos, and there is no sound too.

If a run ies4linux (internet explorer 6 running in wine) it works!

Any tips will be very helpfull ... :D

Thank you!
Andre Souza