Someone

pcm.!default {
   type plug
   slave.pcm "dmix-digital"
}

ctl.dmix-digital {
  type hw
  card 0
}

pcm.digital-hw {
   type hw
   card 0
   device 1
}

ctl.digital-hw {
   type hw
   card 0
}


pcm.dmix-digital {
   type dmix
   ipc_key 1235
   ipc_perm 0666
   slave {
      pcm "digital-hw"
      period_time 0
      period_size 1024
      buffer_size 4096
      rate 48000
   }
}