Use Manual:
HDMI definitions : (Apply HDMI transmit the IIS signal, the pin's definitions must exact same , and not promise compatible with other brands)

This product don't need the source MCLK signal but even the source has MLCK output but has not effect .

Setting button:
        The setting button can setting the PCM and DSD filter parameters and the auto dark on the display .
        Push the setting button one time, the left one display will flashing few seconds ,in term  push the either Select buttons, it will change between 1 to 7, the PCM filters will working follow below list.
        Push the setting button  again , the middle display will flashing few seconds ,in term, push the either Select buttons, it will change between 4 to 7, the DSD filters will working follow below list.
        Push the setting button again, the left and middle displays will flashing few seconds  , in term push the right Select button, the display will change between "ON" and " OF" , "OF" mean the display will auto dark in around 10 seconds after stop operate the buttons. "ON" mean the display always light after power on.
        If the display had not flashing, the select buttons are for change the input channels. The selected input channel's number will show on the right one display.