Have you tested to see if the din midi out is sending any midi data? I got me one of these last week and when the usb is connected to the pc it works. When I power it with a 9v 500mA power adapter nothing comes out of the din midi out, tho the kybd looks like it is powered on, same as with usb. I've asked customer support about this, but they've yet to respond. I also found it conflicts with other drivers of windows and my motu micro lite midi box....notes hanging/sticking. It does not seem to work well at all with the older pure midi hardware as a stand alone controller????????????????