USB Mixer: usb_id=0x2b730017, ctrlif=1, ctlerr=0
Card: Pioneer DJ Corporation DJM-250MK2 at usb-0000:00:12.2-3, high speed
  Unit: 0
    Control: name="Playback 5-6 Playback Switch", index=0
  Unit: 0
    Control: name="Playback 3-4 Playback Switch", index=0
  Unit: 0
    Control: name="Playback 1-2 Playback Switch", index=0
  Unit: 0
    Control: name="Capture 5-6 Capture Switch", index=0
  Unit: 0
    Control: name="Capture 3-4 Capture Switch", index=0
  Unit: 0
    Control: name="Capture 1-2 Capture Switch", index=0
  Unit: 0
    Control: name="Master Capture Level Capture Switch", index=0