multiple sound

[Nguyen Danh Hieu <ndh 21march gmail com>]

 I"ll try to express out my problems with my poor English.
Each time when I play  sound, for example, listen to music, If
suddenly some application alerts me so soundcard is blocked and I
cannot play sound anymore. Or It's is impossible to playsound with xmms and
mplayer at the same time etc...

It needed multi-chanel sound. As I use now in FreeBSD virtual chanel
sound, separate sound streams are mixed in kernel and we hear all them
at /dev/dsp. I just want to know can we do something likeable in Linux
or not.

Thank you.
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