MIDI Creator is a web-based application that can convert sound into MIDI, both sound from files and sound from a microphone directly. MIDI Creator periodically samples the sound, analyzes the frequency, then creates a MIDI notation according to the frequency, volume and duration for that note.

The resulting MIDI is a single channel MIDI. This MIDI can be imported by the DAW application to become a tone pattern which is then combined with other patterns to become a song.

MIDI Creator is very helpful for composers who do not have the ability to play melodic instruments in making notes.

let options = {};
let mc = new MidiCreator(options);

type object

properties

1. name: tempo
   type: number
   default value: 130
   description: Tempo or beat per minute

2. name: ppqn
   type: number
   default value: 96
   description: Pulses per quarter note

3. name: maxTempo
   type: number
   default value: 720
   description: Maximum tempo (for realtime converting only)

4. name: channel
   type: number
   default value: 0
   description: Channel number to used

5. name: pitchMin
   type: number
   default value: 20
   description: Minimum frequency to be process

6. name: pitchMax
   type: number
   default value: 20000
   description: Maximum frequency to be process

7. name: thresholdRms
   type: number
   default value: 0.01
   description: Threshold RMS

8. name: thresholdAmplitude
   type: number
   default value: 0.2
   description: Threshold amplitude

9. name: resolution
   type: number
   default value: 32
   description: Resolution (note per quarter note or note per bar)

10. name: sampleRate
    type: number
    default value: 32000
    description: Sample rate (sample per second)

11. name: minSample
    type: number
    default value: 500
    description: Minimum sampe fo analize frequancy and amplitude

/** 
 * Process local file
 * 
 * @param {File} file Selected file from emelemnt <input type="file">
 */ 
function processLocalFile(file) 
{
    let mc = new MidiCreator({tempo:75, maxTempo:720, resolution:32, sampleRate:32000, channel:3});
    mc.loadLocalAudioFile(file, function(float32Array){
        mc.soundToNote();
        // true to get raw MIDI data (binary)
        let midiData = mc.createMidi(false);
        window.open('data:audio/midi;base64,'+midiData);
    });
}

/** 
 * Process remote file
 * 
 * @param {String} path Remote path. Application will load the file using AJAX request
 */ 
function processRemoteFile(path)
{
    let mc = new MidiCreator({tempo:75, maxTempo:720, resolution:32, sampleRate:32000, channel:3});
    mc.loadRemoteAudioFile(path, function(float32Array){
        mc.soundToNote();
        // true to get raw MIDI data (binary)
        let midiData = mc.createMidi(false);
        window.open('data:audio/midi;base64,'+midiData);
    });
}

MIDI data can be uploaded to server or downloaded as a file.

https://planetbiru.com/apps/midi-creator/