Are you on a Maemo4 device or N900? On the Maemo 4 platform there shouldn't be any issues, on N900 right now there won't be any working sound period. Spenc3 was working on it over the weekend and has found a bug or two that are related to getting the sound working on the N900, but those might also randomly be affecting sound on Maemo4, so there are a few tweaks to be made still. On the other hand, I have had no problems with MP3s on my N800 and Flip for months now... and I'm still waiting for somebody to send me/link me to one of those "MP3s that just doesn't play properly" in Flip... anytime guys, really I'm still waiting so I can help solve that one...