diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 318c6aec..cd8d0893 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -2209,11 +2209,11 @@ void pwm_interrupt_handler() {
 		
           if ((pwm_value == (128 - pwm_amplitude)) && (pwm_rnd_bit == 1)) {
             pwm_value = 128 + pwm_amplitude;
-//            Serial.print("-");
+            Serial.print("-");
           }
           else {
             pwm_value = 128 - pwm_amplitude; 
-//            Serial.print("_");
+            Serial.print("_");
           }
 	  pwm_set_gpio_level(AUDIO_OUT_PIN, pwm_value);
 //	  Serial.println("wav_position: ");