refactor music generation by enhancing audio effects chain and improving velocity and timing humanization

index.html

@@ -459,12 +459,46 @@
     // ===============================
     // GENERATE MUSIC
 
-    const gain = new Tone.Gain(1.3).toDestination();
+    const limiter = new Tone.Limiter(-1);
+
+    // 2. Compressor (giữ âm ổn định)
+    const compressor = new Tone.Compressor({
+        threshold: -18,
+        ratio: 3,
+        attack: 0.01,
+        release: 0.2
+    });
+
+    // 3. EQ (làm ấm piano)
+    const eq = new Tone.EQ3({
+        low: 3,     // tăng bass nhẹ
+        mid: -1,    // giảm mid đục
+        high: 2     // tăng sáng nhẹ
+    });
+
+    // 4. Stereo widen (cho không gian rộng)
+    const stereo = new Tone.StereoWidener(0.6);
+
+    // 5. Reverb (không gian)
+    const reverb = new Tone.Reverb({
+        decay: 4,
+        wet: 0.3
+    });
 
-    const limiter = new Tone.Limiter(-1).connect(gain);
+    // 6. Delay (lofi feel)
+    const delay = new Tone.FeedbackDelay({
+        delayTime: "8n",
+        feedback: 0.25,
+        wet: 0.15
+    });
 
-    const filter = new Tone.Filter(4000, "lowpass").connect(limiter); // mở sáng hơn
-    const reverb = new Tone.Reverb({ decay: 2.5, wet: 0.2 }).connect(filter);
+    // Connect chain
+    delay.connect(reverb);
+    reverb.connect(stereo);
+    stereo.connect(eq);
+    eq.connect(compressor);
+    compressor.connect(limiter);
+    limiter.toDestination();
 
     const piano = new Tone.Sampler({
         urls: {
@@ -485,7 +519,7 @@
         },
         baseUrl: "https://raw.githubusercontent.com/Tonejs/audio/master/salamander/", 
         release: 1
-    }).connect(reverb);
+    }).connect(delay);
 
     // Gọi Tone.start() sẵn khi load trang nếu được
     log("🎹 Đã khởi tạo Lo-fi Synthesizer (Có Limiter chống rè).");
@@ -527,22 +561,25 @@
 
         ws.onmessage = (event) => {
             const data = JSON.parse(event.data);
-            
+
             if (data.notes) {
                 data.notes.forEach(n => {
-                    const freq = Tone.Frequency(n.note, "midi").toNote(); 
-                    let normalizedVelocity = n.velocity / 127; 
-                    
-                    // Đảm bảo không có nốt nào quá nhỏ
-                    normalizedVelocity = Math.max(0.5, n.velocity / 127);
-                    
-                    // duration bây giờ là số (giây), truyền thẳng vào Tone.now()
-                        piano.triggerAttackRelease(
-                            Tone.Frequency(n.note, "midi").toNote(),
-                            Math.min(n.duration, 1.5), // limit duration
-                            Tone.now() + Math.random() * 0.02,
-                            normalizedVelocity
-                        );
+
+                    const noteName = Tone.Frequency(n.note, "midi").toNote();
+
+                    // 🎛 velocity humanize
+                    let velocity = n.velocity / 127;
+                    velocity = Math.max(0.25, velocity);
+
+                    // 🎲 timing humanize
+                    const humanize = (Math.random() - 0.5) * 0.02;
+
+                    piano.triggerAttackRelease(
+                        noteName,
+                        n.duration,
+                        Tone.now() + humanize,
+                        velocity
+                    );
                 });
             }
         };