message: Enable RevD0 as well as RevD
diff: //constants to help define which version of Tympan is being used
  #define TYMPAN_REV_A (2)
  #define TYMPAN_REV_C (3)
  -#define TYMPAN_REV_D (4)
  +#define TYMPAN_REV_D0 (4)
  +#define TYMPAN_REV_D (5)
  //the Tympan is a Teensy audio library "control" object
  #include "control_tlv320aic3206.h" //see in here for more #define statements that are very relevant!
  @@ -56,6 +57,18 @@ class TympanPins { //Teensy 3.6 Pin Numbering
  BT_PIO4 = 2; //PTD0
  enableStereoExtMicBias = NOT_A_FEATURE; //mic jack is already mono, can't do stereo.
  break;
  + case (TYMPAN_REV_D0) :
  + //Teensy 3.6 Pin Numbering
  + resetAIC = 35; //PTC8
  + potentiometer = 15; //PTC0
  + amberLED = 36; //PTC9
  + redLED = 10; //PTC4
  + BT_nReset = 34; //PTE25, active LOW reset
  + BT_REGEN = 31; //must pull high to enable BC127
  + BT_PIO4 = 33; //PTE24
  + enableStereoExtMicBias = 20; //PTD5
  + BT_serial_speed = 9600;
  + break;
  case (TYMPAN_REV_D) :
  //Teensy 3.6 Pin Numbering
  resetAIC = 35; //PTC8
  @@ -123,7 +136,7 @@ class TympanBase : public AudioControlTLV320AIC3206, public Print
  pinMode(pins.redLED,OUTPUT); digitalWrite(pins.redLED,LOW);
  if (pins.enableStereoExtMicBias != NOT_A_FEATURE) {
  pinMode(pins.enableStereoExtMicBias,OUTPUT);
  - setEnableStereoExtMicBias(true); //enable stereo external mics (REV_D)
  + setEnableStereoExtMicBias(false); //enable stereo external mics (REV_D)
  }
  //get the comm pins and setup the regen and reset pins
  