   Serial.print("ctcss tone: ");
   Serial.println(radio.getCtcssFreqHz());
   // mute audio until we get a CTCSS tone
-//  radio.setMute();
+  radio.setMute();
   muted = true;
     
   // configure Arduino LED for

      // set to transmit
      radio.setModeTransmit();
      Serial.println("Tx");
      //radio.setTxSourceMic();
      //radio.setRfPower(1);
    }
  } else if (currently_tx) {
    radio.setModeReceive();
    currently_tx = false;
    Serial.println("Rx");
  }
  
  // handle serial commands

    if (radio.getCtcssToneDetected()) {
      if (muted) {
        muted = false;
        radio.setUnmute();
        Serial.println("tone");
      }
    } else {
      if (!muted) {
        muted = true;
        radio.setMute();
        Serial.println("no tone");
      }
    }
