message: Switch default "Rev D" to D4.
diff: @@ -88,7 +88,7 @@ class TympanPins { //Teensy 3.6 Pin Numbering
  enableStereoExtMicBias = 20; //PTD5
  BT_serial_speed = 9600;
  break;
  - case (TympanRev::D3) : case (TympanRev::D) : //Built for OpenTact
  + case (TympanRev::D3) : //Built for OpenTact
  //Teensy 3.6 Pin Numbering
  resetAIC = 35; //PTC8
  potentiometer = 39; //A20
  @@ -102,7 +102,7 @@ class TympanPins { //Teensy 3.6 Pin Numbering
  BT_serial_speed = 9600;
  Rev_Test = 44;
  break;
  - case (TympanRev::D4) : //RevD release candidate
  + case (TympanRev::D4) : case (TympanRev::D) : //RevD release candidate
  //Teensy 3.6 Pin Numbering
  resetAIC = 35; //PTC8
  potentiometer = 39; //A20
  