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Is there a standard default value that is assumed for expression if none exists in a MIDI file? I'm leaning toward 127, but I don't know if that's correct. I need to add in some default expressions before the file eventually changes it.
Posted : 03/07/2026 3:16 pm
General MIDI Level 2 says the default value of Expression is 127, see PDF page 12, printed page 8. So if whatever you are using to generate sounds from your MIDI files follows the GM2 specification, the default Expression is indeed supposed to be 127. If you are not sure, it should be easy to test.
Posted : 03/07/2026 4:03 pm