update

examples/Sample_Guitar_Tunning_Notes/Sample_Guitar_Tunning_Notes.ino

 }
 //---------------------------------------------------------------------------------------
 void setup() {
-  // put your setup code here, to run once:
-  AudioMemory(4);
-  pinMode(LED_BUILTIN, OUTPUT);
-  playNoteTimer.begin(playNote, 1000);
+    // put your setup code here, to run once:
+    AudioMemory(4);
+    tuner.set_threshold( .05f );
+    pinMode(LED_BUILTIN, OUTPUT);
+    playNoteTimer.begin(playNote, 1000);
 }
 
 void loop() {
-  // put your main code here, to run repeatedly:
-  if (tuner.available()) {
-    float note = tuner.read();
-    float prob = tuner.probability();
-    Serial.printf("Note: %3.2f | Probility: %.2f\n", note, prob);
-  }
-
+    // put your main code here, to run repeatedly:
+    if (tuner.available()) {
+        float note = tuner.read();
+        float prob = tuner.probability();
+        Serial.printf("Note: %3.2f | Probility: %.2f\n", note, prob);
+    }
+    
 }

examples/Simple_Sine/Handle_Commands.ino

 void handleCmds( String cmd ) {
-  String p = cmd;
-
-  if (p.startsWith("f ")) {
-    p.trim();
-    p = p.substring(2);
-    float t = p.toFloat();
-    Serial.print("new frequency: ");
-    Serial.println(t);
-    //AudioNoInterrupts();  // disable audio library momentarily
-    sine.frequency(p.toFloat());
-    //AudioInterrupts();    // enable, both tones will start together
-  }
-  else if (p.startsWith("a ")) {
-    p.trim();
-    p = p.substring(2);
-    float t = p.toFloat();
-    Serial.print("new amplitude: ");
-    Serial.println(t);
-    AudioNoInterrupts();  // disable audio library momentarily
-    sine.amplitude(p.toFloat());
-    AudioInterrupts();    // enable, both tones will start together
-  }
+    String p = cmd;
+    
+    if (p.startsWith("f ")) {
+        p.trim();
+        p = p.substring(2);
+        float t = p.toFloat();
+        Serial.print("new frequency: ");
+        Serial.println(t);
+        //AudioNoInterrupts();  // disable audio library momentarily
+        sine.frequency(p.toFloat());
+        //AudioInterrupts();    // enable, both tones will start together
+    }
+    else if (p.startsWith("a ")) {
+        p.trim();
+        p = p.substring(2);
+        float t = p.toFloat();
+        Serial.print("new amplitude: ");
+        Serial.println(t);
+        AudioNoInterrupts();  // disable audio library momentarily
+        sine.amplitude(p.toFloat());
+        AudioInterrupts();    // enable, both tones will start together
+    }
 }

examples/Simple_Sine/Simple_Sine.ino

 char buffer[10];
 
 void setup() {
-  // put your setup code here, to run once:
-  AudioMemory(4);
-  sine.frequency(30.87);
-  sine.amplitude(1);
+    // put your setup code here, to run once:
+    AudioMemory(4);
+    tuner.set_threshold( .05f );
+    sine.frequency(30.87);
+    sine.amplitude(1);
 }
 
 void loop() {
-  // put your main code here, to run repeatedly:
-  if (tuner.available()) {
-    float note = tuner.read();
-    float prob = tuner.probability();
-    Serial.printf("Note: %3.2f | Probility: %.2f\n", note, prob);
-  }
-  
-  if (Serial.available()) {
-    Serial.readBytesUntil('\n', buffer, 10);
-    handleCmds( buffer );
-  }
+    // put your main code here, to run repeatedly:
+    if (tuner.available()) {
+        float note = tuner.read();
+        float prob = tuner.probability();
+        Serial.printf("Note: %3.2f | Probility: %.2f\n", note, prob);
+    }
+    
+    if (Serial.available()) {
+        Serial.readBytesUntil('\n', buffer, 10);
+        handleCmds( buffer );
+    }
 }