This comes up as an undefined meta message when using the mido library.

I have got varying results from google search including a copyright message, and also one stating its a 'unknown on/off off = 0 on = 127'

Anyone have any idea what it is?

Trying to write a piece of music generation software using MIDI. Not much knowledge about music theory.


  • 1
    Can you provide a MIDI file containing this event?
    – Maxim
    Commented Dec 28, 2019 at 19:57
  • From where do you get this message? If you're writing a generator, you shouldn't have to generate any messages you don't need or want? :) Commented Dec 28, 2019 at 22:20
  • @piiperiReinstateMonica yes I am writing a generator but I'm just trying to figure out what is important to keep and what is not important (as I'm using other midi files to generate my music)
    – staplegun
    Commented Dec 29, 2019 at 0:49
  • Unknown meta messages should be ignored.
    – CL.
    Commented Jan 4, 2020 at 9:41

1 Answer 1


It's unknown MIDI event indeed. I'm the author of DryWetMIDI library. Here you can see all standard events status bytes: https://github.com/melanchall/drywetmidi/blob/develop/DryWetMidi/Core/Events/Info/EventStatusBytes.cs.

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