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Sorry didnt see your above message 'till now. Yes that's right the only faulty part is the old keyboard bed, no longer connected. That message was a mix up.
Getting midi into the interface is still the main aim for me here. And I have just bought a foot pedal controller which only has midi out so a midi in on the keyboard would be even more handy now.
I did the check and there is 3.25 Volts at that test hole, using the black cable furthest on the right in the photo, on the connector, (and a couple of others) Midi coming into the interface has no effect on that voltage.
Is that normal? What do you think it might indicate?
What I meant in a previous message re. another device, was that the Sono 88 has another microcontroller in it from what I can figure out, and that may be the device that handles MIDI, only using the SAM3308 IC as the tone generator?
You would need to trace the USB data connections & see where they end up.
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. Now I understand your message here before. Ok Ill take a look when I can open it.