[Alsa-user] only 2 channels in OSS (Alsa-emulated)

[mr.gamer <mr....@em...>]

hi all, i'm having a bad trouble with the alsa-emulated devices (Such 
/dev/dsp & /dev/adsp )
i'm trying to use "mixxx" a opensource software for audio-mixing, on a 
linux gentoo + sblive 5.1 based system

with such program i need 4 channels (2 channels output, 2 channels 
headphones)
when i try to select /dev/dsp (channel 3,4,5 - 16) all are silent!
so i tried to use native OSS, and i get 6 channels... but the sound is 
very bad (slow play, troubles with clicks)

so.. i have to map the 6 alsa channels in the oss-emulated devices!
can i get help, please ?