pcm.!default {
  type plug
  slave { pcm "jack" }
}

pcm.jack {
  @args [ NAME ]
  @args.NAME {
    type string
    default "alsa-jack"
  }
  type plug
  slave {
    pcm {
       type jack
       client_name $NAME 
       playback_ports {
         0 alsa_pcm:playback_1
         1 alsa_pcm:playback_2
       }
       capture_ports {
         0 alsa_pcm:capture_1
         1 alsa_pcm:capture_2
       }

     } 
  }
}