1.POWER IN: POWER IN: Use the USB B plug to supply power to the product, the power
supply voltage is 5V; the indicator light flashes after power supply, if connected to the
computer, t he indicator light is always on
2.MIDI IN 1 5: MIDI input port , using a standard five pin MIDI cable, connected to the
output port of the MIDI device
3.MIDI OUT 1 2: MIDI output port , using a standard five pin MIDI cable, connected to t he
input port of the MIDI device
4.Update Key: Firmware upgrade button, press and hold the button and power on the
product, the product will enter the upgrade mode, and the indicator light will flash quickly.