JavaScript
// 🎵 Define a simple scale (C Major) to choose melody notes from
const scale = ["C4", "D4", "E4", "F4", "G4", "A4", "B4"]
// 🎼 Define common chord progressions using Roman numeral notation
const chordProgressions = {
simple: ["I", "IV", "V", "I"], // Classic pop progression
jazz: ["ii", "V", "I"], // Jazz turnaround
blues: ["I", "IV", "V", "IV"], // Basic blues progression
}
// 🎹 Map each chord symbol to its corresponding notes in the C Major scale
const chordsInC = {
I: ["C4", "E4", "G4"], // C Major chord
IV: ["F4", "A4", "C5"], // F Major chord
V: ["G4", "B4", "D5"], // G Major chord
ii: ["D4", "F4", "A4"], // D minor chord
}
// 🎸 Define bass notes for each chord
const bassNotesInC = {
I: "C2", // C bass note
IV: "F2", // F bass note
V: "G2", // G bass note
ii: "D2", // D bass note
}
const arpeggioPatterns = [
// 🔹 Basic Patterns
[0, 1, 2, 1], // Alternating (Classic chiptune arpeggio)
[0, 1, 2, 3], // Ascending
[3, 2, 1, 0], // Descending
[0, 2, 1, 3], // Jumping pattern
[0, 1, 0, 2], // NES-style triplet feel
// 🔹 Fast Repeats (Chiptune/NES Style)
[0, 1, 2, 0], // Up and repeat
[0, 2, 1, 2], // Midpoint bounce
[0, 3, 2, 3], // Top bounce
[3, 2, 1, 2], // Downward bounce
[1, 0, 2, 3], // Shifted alternate
// 🔹 Sweep Patterns (Great for Game Soundtracks)
[0, 1, 2, 1], // Gentle wave
[0, 2, 3, 1], // Wide leap sweep
[0, 3, 1, 2], // Broken wave
[3, 0, 2, 1], // Inverted motion
// 🔹 Complex Patterns (More Unique Movement)
[0, 1, 3, 2], // Wide stagger
[3, 2, 0, 1], // Reverse stagger
[0, 2, 1, 0], // Loop with anchor
[1, 3, 0, 2], // Unusual movement
// 🔹 Random-Like Movement (But Still Structured)
[0, 3, 1, 3], // Strong jumps
[3, 1, 2, 0], // Reverse jumps
[0, 2, 3, 0], // Spiral-like
[1, 0, 3, 2], // Offset reverse
// 🔹 Patterns Starting at 1 (Second Note First)
[1, 0, 2, 3], // Starts on the middle note, then moves around
[1, 3, 2, 0], // Starts high, moves down
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