Implement pitch detection in tuner frequency method

Replaces the placeholder in getTunerFrequency with actual pitch detection using the YIN algorithm. Stores analyser and pitch detection function as instance properties for reuse and reliability.

Author: 7se7en72025

js/utils/synthutils.js

@@ -2275,8 +2275,10 @@ function Synth() {
         this.tunerMic = new Tone.UserMedia();
         await this.tunerMic.open();
 
-        const analyser = new Tone.Analyser("waveform", 2048);
-        this.tunerMic.connect(analyser);
+        this.tunerAnalyser = new Tone.Analyser("waveform", 2048);
+        this.tunerMic.connect(this.tunerAnalyser);
+
+        const analyser = this.tunerAnalyser;
 
         const YIN = (sampleRate, bufferSize = 2048, threshold = 0.1) => {
             // Low-Pass Filter to remove high-frequency noise
@@ -2353,7 +2355,8 @@ function Synth() {
             };
         };
 
-        const detectPitch = YIN(Tone.context.sampleRate);
+        this.detectPitch = YIN(Tone.context.sampleRate);
+        const detectPitch = this.detectPitch;
         let tunerMode = "chromatic"; // Add mode state
         let targetPitch = { note: "A4", frequency: 440 }; // Default target pitch
 
@@ -3169,12 +3172,11 @@ function Synth() {
      * @returns {number} The detected frequency in Hz
      */
     this.getTunerFrequency = () => {
-        if (!this.tunerAnalyser) return 440; // Default to A4 if no analyser
+        if (!this.tunerAnalyser || !this.detectPitch) return 440; // Default to A4 if no analyser
 
         const buffer = this.tunerAnalyser.getValue();
-        // TODO: Implement actual pitch detection algorithm
-        // For now, return a default value
-        return 440;
+        const pitch = this.detectPitch(buffer);
+        return pitch > 0 ? pitch : 440;
     };
 
     // Test function to verify tuner accuracy