AG, I have a scope but the k/b is too big (and heavy) for my bench, aka kitchen worktop. I could remove the board but I'm not sure how I could trigger notes. But what would I be looking for anyway, one data stream looks much like another - to me anyway?
I had the external PSU apart and the capacitor tested good as did the voltage. Today I tried to get a screenshot of the MIDI strangeness in 'OX' but Sod's Law prevailed, it worked without issue