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f0a176a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | import { Midi } from '@tonejs/midi';
/**
* Generate a sample "Twinkle Twinkle Little Star" MIDI with both hands.
*/
export function generateSampleMidi() {
const midi = new Midi();
// Right hand melody (MIDI >= 60)
const rhTrack = midi.addTrack();
rhTrack.name = 'Right Hand';
// C C G G A A G - F F E E D D C
// Then: G G F F E E D - G G F F E E D
const melody = [
// Phrase 1
60, 60, 67, 67, 69, 69, 67,
// Phrase 2
65, 65, 64, 64, 62, 62, 60,
// Phrase 3
67, 67, 65, 65, 64, 64, 62,
// Phrase 4
67, 67, 65, 65, 64, 64, 62,
// Phrase 5 (repeat phrase 1)
60, 60, 67, 67, 69, 69, 67,
// Phrase 6 (repeat phrase 2)
65, 65, 64, 64, 62, 62, 60,
];
const durations = [
0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1,
];
let t = 0;
melody.forEach((note, i) => {
rhTrack.addNote({
midi: note,
time: t,
duration: durations[i] * 0.9,
velocity: 0.8,
});
t += durations[i];
});
// Left hand accompaniment (MIDI < 60)
const lhTrack = midi.addTrack();
lhTrack.name = 'Left Hand';
const chords = [
// Phrase 1: C major
{ notes: [48, 52, 55], time: 0, dur: 2 },
{ notes: [48, 52, 55], time: 2, dur: 1 },
// Phrase 2: F major -> C major
{ notes: [41, 45, 48], time: 3, dur: 2 },
{ notes: [48, 52, 55], time: 5, dur: 1 },
// Phrase 3: C -> G -> Am -> F
{ notes: [48, 52], time: 7, dur: 1 },
{ notes: [43, 47], time: 8, dur: 1 },
{ notes: [45, 48], time: 9, dur: 1 },
// Phrase 4: same
{ notes: [41, 45], time: 10, dur: 1 },
{ notes: [48, 52], time: 11, dur: 1 },
{ notes: [43, 47], time: 12, dur: 1 },
{ notes: [45, 48], time: 13, dur: 1 },
// Phrase 5
{ notes: [48, 52, 55], time: 14, dur: 2 },
{ notes: [48, 52, 55], time: 16, dur: 1 },
// Phrase 6
{ notes: [41, 45, 48], time: 17, dur: 2 },
{ notes: [48, 52, 55], time: 19, dur: 2 },
];
chords.forEach((chord) => {
chord.notes.forEach((note) => {
lhTrack.addNote({
midi: note,
time: chord.time,
duration: chord.dur * 0.9,
velocity: 0.6,
});
});
});
return midi;
}
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