See post #76
I think you need to take a step back and start over
Where did you get that code and schematic you show in post #1
I get that code and schematic by asking AI (chat gpt and gemini) i know its wrong 
i should've search on youtube and ask this forum
That explains a lot.
It's wrong and it's just getting worse.
I would forget everything you have seen here so far and look for a tutorial or video that includes a schematic and code for the midi device you want to build.
Start wit something simple
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