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    Making life easy to create a MIDI-app on the web. Includes a library to program synesthesia into your app for memory recognition or for creating trippy effects. Convert soundfonts for Guitar, Bass, Drums, ect. into code that can be read by the browser. Supports multiple simultaneous instruments and perfect timing.
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    Code examples - from the repo

    • Basic - the most basic implementation.
    • MIDIPlayer - how to parse MIDI files, and interact with the data stream.
    • WhitneyMusicBox - a audio/visual experiment by Jim Bumgardner

    Demos

    • MIDI Pictures: Pictures of the 128 standard instruments on MIDI piano keyboards
    • MIDI Soundfonts: Pre-rendered General MIDI soundfonts that can be used immediately with MIDI.js

    Generating Base64 Soundfonts

    There is two generators for MIDI.js soundfonts:

    • NodeJS package for creating soundfonts from WAV files - by Patrick Wolleb
    • Ruby package for creating soundsfonts from SF2 files - by Mohit Muthanna

    To dive in quickly Benjamin Gleitzman has created a package of pre-rendered sound fonts.

    API

    MIDI.loadPlugin.js - Decides which framework is best to use

    // interface to download soundfont, then execute callback;
    MIDI.loadPlugin(onsuccess);
    // simple example to get started;
    MIDI.loadPlugin({
        instrument: "acoustic_grand_piano", // or the instrument code 1 (aka the default)
        instruments: [ "acoustic_grand_piano", "acoustic_guitar_nylon" ], // or multiple instruments
        onsuccess: function() { }
    });
    

    MIDI.Plugin.js - Controls MIDI output

    MIDI.noteOn(channel, note, velocity, delay);
    MIDI.noteOff(channel, note, delay);
    MIDI.chordOn(channel, [note, note, note], velocity, delay);
    MIDI.chordOff(channel, [note, note, note], delay);
    MIDI.keyToNote = object; // A0 => 21
    MIDI.noteToKey = object; // 21 => A0
    

    MIDI.Player.js - Plays MIDI stream

    MIDI.Player.currentTime = integer; // time we are at now within the song.
    MIDI.Player.endTime = integer; // time when song ends.
    MIDI.Player.playing = boolean; // are we playing? yes or no.
    MIDI.Player.loadFile(file, onsuccess); // load .MIDI from base64 or binary XML request.
    MIDI.Player.start(); // start the MIDI track (you can put this in the loadFile callback)
    MIDI.Player.resume(); // resume the MIDI track from pause.
    MIDI.Player.pause(); // pause the MIDI track.
    MIDI.Player.stop(); // stops all audio being played, and resets currentTime to 0.
    

    Listener for when notes are played

    MIDI.Player.removeListener(); // removes current listener.
    MIDI.Player.addListener(function(data) { // set it to your own function!
        var now = data.now; // where we are now
        var end = data.end; // time when song ends
        var channel = data.channel; // channel note is playing on
        var message = data.message; // 128 is noteOff, 144 is noteOn
        var note = data.note; // the note
        var velocity = data.velocity; // the velocity of the note
        // then do whatever you want with the information!
    });
    

    Smooth animation interpolating between onMidiEvent calls

    MIDI.Player.clearAnimation(); // clears current animation.
    MIDI.Player.setAnimation(function(data) {
        var now = data.now; // where we are now
        var end = data.end; // time when song ends
        var events = data.events; // all the notes currently being processed
        // then do what you want with the information!
    });
    

    Effects available for WebAudioContext via Tuna.js

    MIDI.setEffects([
            {
             type: "MoogFilter",
            bufferSize: 4096,
            bypass: false,
            cutoff: 0.065,
            resonance: 3.5
        },
        {
            type: "Bitcrusher",
            bits: 4,
            bufferSize: 4096,
            bypass: false,
            normfreq: 0.1
        },
        {
            type: "Phaser",
            rate: 1.2, // 0.01 to 8 is a decent range, but higher values are possible
            depth: 0.3, // 0 to 1
            feedback: 0.2, // 0 to 1+
            stereoPhase: 30, // 0 to 180
            baseModulationFrequency: 700, // 500 to 1500
            bypass: 0
        }, {
            type: "Chorus",
            rate: 1.5,
            feedback: 0.2,
            delay: 0.0045,
            bypass: 0
        }, {
            type: "Delay",
            feedback: 0.45, // 0 to 1+
            delayTime: 150, // how many milliseconds should the wet signal be delayed? 
            wetLevel: 0.25, // 0 to 1+
            dryLevel: 1, // 0 to 1+
            cutoff: 20, // cutoff frequency of the built in highpass-filter. 20 to 22050
            bypass: 0
        }, {
            type: "Overdrive",
            outputGain: 0.5, // 0 to 1+
            drive: 0.7, // 0 to 1
            curveAmount: 1, // 0 to 1
            algorithmIndex: 0, // 0 to 5, selects one of our drive algorithms
            bypass: 0
        }, {
            type: "Compressor",
            threshold: 0.5, // -100 to 0
            makeupGain: 1, // 0 and up
            attack: 1, // 0 to 1000
            release: 0, // 0 to 3000
            ratio: 4, // 1 to 20
            knee: 5, // 0 to 40
            automakeup: true, // true/false
            bypass: 0
        }, {
            type: "Convolver",
            highCut: 22050, // 20 to 22050
            lowCut: 20, // 20 to 22050
            dryLevel: 1, // 0 to 1+
            wetLevel: 1, // 0 to 1+
            level: 1, // 0 to 1+, adjusts total output of both wet and dry
            impulse: "./inc/tuna/impulses/impulse_rev.wav", // the path to your impulse response
            bypass: 0
        }, {
            type: "Filter",
            frequency: 20, // 20 to 22050
            Q: 1, // 0.001 to 100
            gain: 0, // -40 to 40
            bypass: 1, // 0 to 1+
            filterType: 0 // 0 to 7, corresponds to the filter types in the native filter node: lowpass, highpass, bandpass, lowshelf, highshelf, peaking, notch, allpass in that order
        }, {
            type: "Cabinet",
            makeupGain: 1, // 0 to 20
            impulsePath: "./inc/tuna/impulses/impulse_guitar.wav", // path to your speaker impulse
            bypass: 0
        }, {
            type: "Tremolo",
            intensity: 0.3, // 0 to 1
            rate: 0.1, // 0.001 to 8
            stereoPhase: 0, // 0 to 180
            bypass: 0
        }, {
            type: "WahWah",
            automode: true, // true/false
            baseFrequency: 0.5, // 0 to 1
            excursionOctaves: 2, // 1 to 6
            sweep: 0.2, // 0 to 1
            resonance: 10, // 1 to 100
            sensitivity: 0.5, // -1 to 1
            bypass: 0
        }
    ]);
    

    Libraries

    • colorspace.js: Color conversions, music isn’t complete without!
      Color.Space(0xff0000, "HEX>RGB>HSL");
    • dom_request_script.js: Loads scripts in synchronously, or asynchronously.
      DOMLoader.script.add(src, onsuccess);
    • dom_request_xhr.js: Cross-browser XMLHttpd request.
      DOMLoader.sendRequest(src, onsuccess);
    • synesthesia.js: Note-to-color mappings (from Isaac Newton onwards).

    Many thanks to the authors of these libraries

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