asound.conf

pcm.hdmi_direct {
  type asym
  playback.pcm {
    type plug
    slave.pcm "remap-hw27"
  }
}

pcm.!remap-hw27 {
  type route
  slave.pcm "hw:2,7"
  ttable {
    0.0= 1
    1.1= 1
    2.4= 1
    3.5= 1
    4.2= 1
    5.3= 1
    6.6= 1
    7.7= 1
  }
}