🎸 Fretboard Visualizer

(https://ifnowcode.github.io/fretboard/)[https://ifnowcode.github.io/fretboard/]

A fast, deterministic, browser‑based fretboard engine for exploring scales, chords, tunings, intervals, enharmonics, and generated progressions across multiple stringed instruments. Built with clean, modular JavaScript and a canvas‑based rendering pipeline.

--

✨ Features

• Independent chord + scale selection
  Choose any chord over any scale (e.g., D major over C Ionian).

  • Full enharmonic control
    Toggle flats/sharps with correct rendering and canonical internal note logic.

  • Chord dictionary + interval engine Supports major, minor, dominant, altered, suspended, extended, jazz chords, and more.

  • Scale/mode system
    Includes major modes, pentatonics, blues, harmonic minor, chromatic, and custom sets.

  • Multi‑instrument tunings Guitar, bass, violin, cello, mandolin, ukulele, banjo, and custom tunings.

  • Root highlighting
    Optional root‑note detection with visual emphasis.

  • Fretboard markers Standard 3‑5‑7‑12 markers with double‑dot at 12.

  • Song generator (GenSong) Random or key‑specific chord progressions with serialization to/from localStorage.

---

🧩 Architecture

• index.html — UI layout and control bars

• fretboard.js — rendering engine, enharmonic logic, event system

• gensong.js — chord‑progression generator with save/load support

• CHORD_INTERVALS / MODES / TUNINGS — declarative musical data tables

• Canvas renderer — deterministic, no DOM churn, no leaks

---

🚀 Usage

Fretboard

• Select Chord Root, Chord Type, Scale Root, Scale Mode

• Toggle Show Scale, Hide Chord, Hide Scale, Show Root, Flats

• Flip string order for left‑handed or upside‑down visualization

GenSong

js

const g = new GenSong();
g.random();          // random key
g.inKeyOf("Db", 8);  // fixed key
g.save("idea1");     // persist
g.load("idea1");     // restore
console.log(g.song());

---

📦 Local Storage Integration

The generator supports:

• save(name) — serialize current progression

• load(name) — restore a saved progression

Useful for sketching musical ideas and recalling them later.

---

🛠 Development

• Pure JavaScript, no dependencies

• Canvas‑based rendering

• Deterministic event‑driven UI

• Modular data tables for chords, scales, tunings

• Clean separation of display vs. internal canonical note logic