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

pcm.dmixer {
    type dmix
    ipc_key 1024
    ipc_key_add_uid 0
    ipc_perm 0666
    slave {
        pcm "hw:0,3"    # HDMI CARD AND DEVICE
        period_time 0
        period_size 1024
        buffer_size 8192
        rate 48000 #or 44100
    }
}

ctl.dmixer {
    type hw
    card 0
}