void setup()
{
    pinMode(16, INPUT_PULLUP); // D16 for "mute" button
    pinMode(17, INPUT_PULLUP); // D17 for "deafen" button
    Serial.begin(115200);
}

void loop()
{
    // ...existing code...
    if (digitalRead(16) == LOW)
    { // Button on D16 pressed
        Serial.println("mute");
        delay(200); // Debounce delay
    }
    if (digitalRead(17) == LOW)
    { // Button on D17 pressed
        Serial.println("deafen");
        delay(200); // Debounce delay
    }
}