The unit was delivered quickly and flawlessly. Connect it to the Keybord Yamaha YPT 210 and first went nothing. I have checked MIDI Out u. -In, I had (apparently) made no mistake. Until I came out that the MIDI-Out cable must be plugged into the MIDI In socket of the keyboard. I had set out to Out and In to In. The truth is that out in in and in out. Then everything was fine and the device is working properly since. Great value, the original part of Yamaha would have cost about 60.00 ....