说明书的介绍
• Connect MIDI I/O to a computer that is powered on.
• Connect MIDI I/O to a powered USB hub. • Connect MIDI I/O to an external power
supply (9–12 Volts DC, 500 mA; Polarity: Tip = Plus, Ring = Minus).
但不知道插头的规格，我试了几个，孔太细，插不进去
哪位知道这个设备外接电源的情况，请给说说
如果有原配的，我也可以买