let midiToFreqMap; // Store MIDI-to-frequency mappings

let playing = false;

​

function setup() {

  createCanvas(400, 200);

  textAlign(CENTER, CENTER);

  textSize(16);

​

  // Initialize an oscillator

  osc = new p5.Oscillator('sine');

  osc.start();

  osc.amp(0); // Start silent

​

  // Create a mapping for MIDI notes to frequencies

  midiToFreqMap = {};

  for (let midi = 21; midi <= 108; midi++) { // Piano range (A0 to C8)

    midiToFreqMap[midi] = midiToFreq(midi);

  }

​

  text("Press keys A-L for piano notes!", width / 2, height / 2);

}

​

function draw() {

  background(220);

}

​

// Function to play MIDI note when a key is pressed

function keyPressed() {

  let midiNote = getMidiFromKey(key); // Map the key to a MIDI note

  if (midiNote) {

    let freq = midiToFreqMap[midiNote]; // Get the frequency for the MIDI note

    if (freq) {

      playNote(freq); // Play the note

    }

  }

}

​

function keyReleased() {

  stopNote(); // Stop the note when key is released

}

​

// Map specific keys to MIDI notes (A-L corresponds to white keys)

function getMidiFromKey(key) {

  const midiKeys = {

    'A': 60, // Middle C

    'S': 62, // D

    'D': 64, // E

    'F': 65, // F

    'G': 67, // G

    'H': 69, // A

    'J': 71, // B

    'K': 72, // High C

    'L': 74  // D

  };

  return midiKeys[key.toUpperCase()] || null;

}

​

​

​

// Function to play a note

function playNote(freq) {

  osc.freq(freq); // Set oscillator frequency

  osc.amp(0.5, 0.1); // Smooth fade-in

  playing = true;

}

​

// Function to stop the note

function stopNote() {

  osc.amp(0, 0.1); // Smooth fade-out

  playing = false;

}

​