this /etc/asound.conf got software mixing via dmix working on my nforce3 250 chipset.
Code:
pcm.card0 {
type hw
card 0
}
pcm.!default {
type plug
slave.pcm "dmixer"
}
pcm.dmixer {
type dmix
ipc_key 1025
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 32768
rate 44100
}
bindings {
0 0
1 1
}
}