Re: MIDI keyboard fault
Ah, then you obviously don't need anyone's help finding a top class MIDI interface (!) but since you have one I think it is only fair to ask you to repeat the experiment using MidiOX running on the dedicated PC with its high end MIDI interface.
Your earlier experiments may only be revealing that the USB MIDI interface is not working as well as you might hope, as AG suggested. I would certainly try that before going to the extreme length of trying to find a replacement microprocessor (you would need not only the microprocessor but the code which goes in it, unless it has a separate firmware eprom).
'Always try the simple stuff first'. If there are things you can try using just whatever you already have to hand without changing or buying additional parts, do that first.
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