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pcm.dmixer {
    type dmix
    ipc_key 1024
    slave {
        pcm "hw:1,0"
        period_time 0
        period_size 1024
        buffer_size 8192
        #periods 128
      #rate 44100
     }
pcm.usbdmix {
    type plug
    slave.pcm "dmixer"
}