unfortunately, my Gentoo box is not connected to Internet ( i'm writing this from my office :D )
Andrey, I've try your advice my alsa still not working. First I try to put asym after dmix on ALSA_PCM_PLUGINS, but it still not working. And then I run emerge -pv alsa-lib, and look at the USE Flag. I saw empty there, so I put empty on ALSA_PCM_PLUGINS, then I emerge alsa-lib alsa-utils mpg123 again. But the results still the same. I try to put open on ALSA_PCM_PLUGINS, eventhough i didn't saw that flag on emerge -pv alsa-lib, but there is no progress. I still got the same error with the one before. -- Salam, Marc