Someone

pcm.card0 {
type hw
card 0
}

pcm.!default {
type plug
slave.pcm "dmixer"

}


pcm.dmixer {
type dmix
ipc_key 1025
slave {
pcm "hw:1,0"
period_time 0
period_size 2048
buffer_size 32768
rate 48000
}
bindings {
0 0
1 1
}
}













~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: CMI8738MC6 [C-Media PCI CMI8738-MC6], device 0: CMI8738-MC6 [C-Media PCI DAC/ADC]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: CMI8738MC6 [C-Media PCI CMI8738-MC6], device 1: CMI8738-MC6 [C-Media PCI 2nd DAC]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: CMI8738MC6 [C-Media PCI CMI8738-MC6], device 2: CMI8738-MC6 [C-Media PCI IEC958]
  Subdevices: 1/1