/dev/dsp and the audio group

[Alessandro Amici <amici@pil.phys.uniroma1.it>]

hi,

I installed potato and now upgraded to 2.2r1 and have a problem with
sound.
permissions of the /dev/dsp* devices are crw-rw---- and ownership is
root.audio.
this seem to be sane if as a counterpart audio applications were owned
by root.audio and set sgid, but this is not the case!
I checked mpg123 and xmms, they are all not able to write to /dev/dsp*
devices.

changing owner and permissions everything works.

did I mess up something in the installation?
is there a standard way to make all audio apps working properly?

thanks,
alessandro