A MIDI file isn't a recording. It's a list of notes: which key, when, for how long, on which instrument. That's exactly what MIDI.PLAY needs, so there's nothing to work out.
Steps
- Open MIDI.PLAY.
- Drag the
.midor.midifile into your library, or click to choose it. - If the file has several instruments, pick the one you want to play. The others play along as backing.
Only have a recording? See turning an MP3 into notes or a YouTube video into a tutorial.
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