Hanging notes, missed commands (solved)

[Spartacus1066]

I have solved the issue, but I can't be the only one. Using this to accept USB MIDI from an EWI and sent to BLE (Nano 33 ioT will do since it has m0) RP2040 connect might be better.
Anyway the solution is to add a bit of Delay to the loop. Of course I want as little latency as possible
delayMicroseconds(250); is too little if only going USB --> UART
delayMicroseconds(500); has worked in testing and delay(1); before the last } of loop() is plenty to give it enough time.