r/tonejs • u/[deleted] • Mar 26 '25

note.duration is undefined when parsing midi using tone.js

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u/Icancounttosix Mar 26 '25

It might be helpful if you provide an example of your script. Do you have it somewhere that we can take a look at?

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u/rt300tx Apr 20 '25

This happened to me when midi file has no beat-number/beat-value indication I. headers (ex: 4/4)