 }
 
 void fadeBacklight( int newColor, int oldColor = 0 ) {
+  // beware the PWM and ATMega timers. 
+  // when green and blue are on different pairs, there's flicker.
+  // so v11 of the PCB puts Blue and Green on the same pair.
+  // there might be flicker with Red, but since that never gets mixed in 
+  // except during a transition, it shouldn't really matter.
   if ( newColor == REDCOLOR ) {
     for (int i = 0; i < 255; i++) {
     Adafruit::setBacklight(i, 255-i, 0);

    // update LED. Off with connected antenna, 3 
    if (antennaStatus == 3) {
      digitalWrite(LED_BUILTIN, LOW);
      digitalWrite(4, LOW);
    } else {
      digitalWrite(LED_BUILTIN, HIGH);
      digitalWrite(4, HIGH);
    } //endif antenna status
  }


  pinMode(2, INPUT);
  // pin 13, used for antenna LED
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  // pin 4, used for antenna LED
  pinMode(A1, OUTPUT);
  digitalWrite(A1, LOW);
  // pins for RGB LCD colors
  pinMode(REDLCDLED, OUTPUT);
  pinMode(GREENLCDLED, OUTPUT);
