Problem With Serial MIDI

C
craiglindley posted May 3, 21:16:

I'm running a version of the original SamplerBox on a RPi 3. I built the serial MIDI interface and I thought it was working correctly but this morning I realized the serial MIDI interface will only start working if I plug in my USB MIDI keyboard first, then it works fine. The USB MIDI works every time.

Any clues?

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