Files do not import in DAW

[tomhaydn]

From my research I've found that Ableton supports 3 formats SMF0, SMF1, SMF2: https://help.ableton.com/hc/en-us/articles/209068169-Understanding-MIDI-files

However files do not import, Ableton seems to just reject them with no error message or details. See my export function:

notes format:

[{
        pitch: string note,
        startTick: Tn,
        duration: Tn,
        velocity: double,
}]

const createTrack = async (notes) => {
  const track = new Track();
  track.setTempo(120, 0);
  track.addCopyright('TEST');
  track.addTrackName('Track 1');

  notes.forEach((note) => {
    const noteToAdd = new NoteEvent(note);
    track.addEvent(noteToAdd);
  });
  const writer = new Writer(track);
  const buffer = Buffer.from(writer.buildFile());
  try {
    await writeFileSync('TEST.mid', buffer);
  } catch (err) {
    if (err) throw err;
  }
};

System: PC Node version: v16.15.0

If there are any more details I can provide let me know! Really want to see this work :)

[shawnbro]

It's likely because it's saved as .midi rather than .mid

[grimmdude]

Hey @tomhaydn,

It looks like the issue is that you're passing a string for startTick, but that parameter only accepts a number. Apologies if that isn't as well documented as it could be.

Here's your code adjusted and tested with Abelton Live 11:

var MidiWriter = require('midi-writer-js');
const fs = require('fs');

const createTrack = async (notes) => {
  const track = new MidiWriter.Track();
  track.setTempo(120, 0);
  track.addCopyright('TEST');
  track.addTrackName('Track 1');

  notes.forEach((note) => {
    const noteToAdd = new MidiWriter.NoteEvent(note);
    track.addEvent(noteToAdd);
  });
  const writer = new MidiWriter.Writer(track);
  const buffer = Buffer.from(writer.buildFile());
  try {
    await fs.writeFileSync('TEST.mid', buffer);
  } catch (err) {
    if (err) throw err;
  }
};

createTrack([{pitch: 'C4', startTick: 44, duration: 'T4', velocity: 100}]);