diff --git a/examples/BAExpansionCalibrate/BAExpansionCalibrate.ino b/examples/BAExpansionCalibrate/BAExpansionCalibrate.ino
index c438734..697eee0 100644
--- a/examples/BAExpansionCalibrate/BAExpansionCalibrate.ino
+++ b/examples/BAExpansionCalibrate/BAExpansionCalibrate.ino
@@ -13,9 +13,6 @@
  * When prompted turn the appropriate POT in the specified direction and
  * enter any character on the terminal input line and press enter to send the character.
  */
-#define TGA_PRO_REVB // Specify our hardware revision
-#define TGA_PRO_EXPAND_REV2 // Specify we are using the EXPANSION CONTROL BOARD REV2
-
 #include "BALibrary.h"
 
 using namespace BALibrary;
@@ -27,6 +24,8 @@ void setup() {
   delay(100);
   Serial.begin(57600);
   delay(500); // long delay to wait for Serial to init
+
+  TGA_PRO_EXPAND_REV2(); // Set the expansion board revision
   
   // put your setup code here, to run once:
   Serial.println("Calibrating POT1");
diff --git a/examples/Delay/SoundOnSoundExpansionDemo/SoundOnSoundExpansionDemo.ino b/examples/Delay/SoundOnSoundExpansionDemo/SoundOnSoundExpansionDemo.ino
index f9b7e22..85c26e6 100644
--- a/examples/Delay/SoundOnSoundExpansionDemo/SoundOnSoundExpansionDemo.ino
+++ b/examples/Delay/SoundOnSoundExpansionDemo/SoundOnSoundExpansionDemo.ino
@@ -20,9 +20,6 @@
  * SW2 - Push this button to clear out the sound circulating in the delay.
  * 
  */
-#define TGA_PRO_REVB // Set which hardware revision of the TGA Pro we're using
-#define TGA_PRO_EXPAND_REV2 // pull in the pin definitions for the Blackaddr Audio Expansion Board.
-
 #include "BALibrary.h"
 #include "BAEffects.h"
 
@@ -118,6 +115,7 @@ delay(100);
   codec.disable();
   AudioMemory(128);
 
+  TGA_PRO_EXPAND_REV2(); // Set the expansion board revision
   SPI_MEM0_1M(); // set the Spi memory size
 
   // Enable the codec
diff --git a/examples/Tests/TGA_PRO_MEM2_EXP/PhysicalControls.cpp b/examples/Tests/TGA_PRO_MEM2_EXP/PhysicalControls.cpp
index 51f4c76..913587a 100644
--- a/examples/Tests/TGA_PRO_MEM2_EXP/PhysicalControls.cpp
+++ b/examples/Tests/TGA_PRO_MEM2_EXP/PhysicalControls.cpp
@@ -1,5 +1,3 @@
-#define TGA_PRO_EXPAND_REV2
-
 #include "BALibrary.h"
 using namespace BALibrary;
 
diff --git a/examples/Tests/TGA_PRO_MEM2_EXP/TGA_PRO_MEM2_EXP.ino b/examples/Tests/TGA_PRO_MEM2_EXP/TGA_PRO_MEM2_EXP.ino
index bd4ea7f..0fedcb1 100644
--- a/examples/Tests/TGA_PRO_MEM2_EXP/TGA_PRO_MEM2_EXP.ino
+++ b/examples/Tests/TGA_PRO_MEM2_EXP/TGA_PRO_MEM2_EXP.ino
@@ -42,7 +42,7 @@
  * 
  */
 
-#define RUN_MIDI_TEST // Uncomment this line to run the MIDI test.
+//#define RUN_MIDI_TEST // Uncomment this line to run the MIDI test.
 //#define RUN_MEMO_TEST // Uncomment this line to run the MEM0 test.
 //#define RUN_MEM1_TEST // (Teensy 3.5/3/6 only!) Uncomment this line to run the MEM1 test.
 
@@ -94,6 +94,8 @@ void setup() {
   codec.setHeadphoneVolume(0.8f); // Set headphone volume
   configPhysicalControls(controls, codec);
 
+  TGA_PRO_EXPAND_REV2(); // Macro to declare expansion board revision
+
   // Run the initial Midi connectivity and SPI memory tests.
 #if defined(RUN_MIDI_TEST)
   if (uartTest()) { Serial.println("MIDI Ports testing PASSED!"); }
diff --git a/keywords.txt b/keywords.txt
index 02b9b41..303d8a6 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -7,6 +7,7 @@
 #######################################
 
 BAAudioControlWM8731	KEYWORD1
+BAAudioControlWM8731master    KEYWORD1
 BASpiMemory             KEYWORD1
 BAGpio                  KEYWORD1
 BAAudioEffectDelayExternal	KEYWORD1
diff --git a/src/BAAudioControlWM8731.h b/src/BAAudioControlWM8731.h
index c284e22..0eae269 100644
--- a/src/BAAudioControlWM8731.h
+++ b/src/BAAudioControlWM8731.h
@@ -27,7 +27,7 @@
 
 namespace BALibrary {
 
-constexpr int WM8731_NUM_REGS = 10; // Number of registers in the internal shadow array
+constexpr int WM8731_NUM_REGS = 10; ///< Number of registers in the internal shadow array
 
 /**************************************************************************//**
  * BAAudioControlWM8731 provides an API for configuring the internal registers
@@ -45,7 +45,7 @@ public:
 	void disable(void);
 
 	/// First disable, then cleanly power up and unmute the codec.
-	void enable(void);
+	virtual void enable(void);
 
 	/// Set the input gain of the codec's PGA for the left (TRS Tip) channel.
 	/// @param val an interger value from 31 = +12dB . . 1.5dB steps down to 0 = -34.5dB
@@ -119,8 +119,8 @@ public:
 protected:
 	// A shadow array for the registers on the codec since the interface is write-only.
 	int regArray[WM8731_NUM_REGS];
+    bool m_wireStarted = false;
 
-private:
 	// low-level write command
 	bool write(unsigned int reg, unsigned int val);
 
@@ -130,8 +130,19 @@ private:
 	// Sets pullups, slew rate and drive strength
 	void setOutputStrength(void);
 
-	bool m_wireStarted = false;
+};
 
+/**************************************************************************//**
+ * BAAudioControlWM8731master provides an API for configuring the internal registers
+ * of the WM8731 codec when the codec is in master mode (Teensy is slave).
+ * @details The hardware from Blackaddr Audio does not populate the XTAL needed
+ * for CODEC master mode. Please refer to the schematic for your board for the
+ * necessary parts and modifications.
+ *****************************************************************************/
+class BAAudioControlWM8731master : public BAAudioControlWM8731 {
+public:
+    /// First disable, then cleanly power up and unmute the codec.
+    void enable(void) override;
 };
 
 } /* namespace BALibrary */
diff --git a/src/peripherals/BAAudioControlWM8731.cpp b/src/peripherals/BAAudioControlWM8731.cpp
index f822b13..1600088 100644
--- a/src/peripherals/BAAudioControlWM8731.cpp
+++ b/src/peripherals/BAAudioControlWM8731.cpp
@@ -398,4 +398,63 @@ void BAAudioControlWM8731::setOutputStrength(void)
 #endif
 }
 
+// Powerup and unmute the codec
+void BAAudioControlWM8731master::enable(void)
+{
+
+    disable(); // disable first in case it was already powered up
+
+    //Serial.println("Enabling codec");
+    if (m_wireStarted == false) {
+        Wire.begin();
+        m_wireStarted = true;
+    }
+    setOutputStrength();
+
+    // Sequence from WAN0111.pdf
+    // Begin configuring the codec
+    resetCodec();
+    delay(100); // wait for reset
+
+    // Power up all domains except OUTPD and microphone
+    regArray[WM8731_REG_POWERDOWN] = 0x12;
+    write(WM8731_REG_POWERDOWN, regArray[WM8731_REG_POWERDOWN]);
+    delay(100); // wait for codec powerup
+
+
+    setAdcBypass(false); // causes a slight click
+    setDacSelect(true);
+    setHPFDisable(true);
+    setLeftInputGain(0x17); // default input gain
+    setRightInputGain(0x17);
+    setLeftInMute(false); // no input mute
+    setRightInMute(false);
+    setDacMute(false); // unmute the DAC
+
+    // link, but mute the headphone outputs
+    regArray[WM8731_REG_LHEADOUT] = WM8731_LEFT_HEADPHONE_LINK_MASK;
+    write(WM8731_REG_LHEADOUT, regArray[WM8731_REG_LHEADOUT]);      // volume off
+    regArray[WM8731_REG_RHEADOUT] = WM8731_RIGHT_HEADPHONE_LINK_MASK;
+    write(WM8731_REG_RHEADOUT, regArray[WM8731_REG_RHEADOUT]);
+
+    /// Configure the audio interface
+    write(WM8731_REG_INTERFACE, 0x42); // I2S, 16 bit, MCLK master
+    regArray[WM8731_REG_INTERFACE] = 0x42;
+
+    write(WM8731_REG_SAMPLING, 0x20);  // 256*Fs, 44.1 kHz, MCLK/1
+    regArray[WM8731_REG_SAMPLING] = 0x20;
+    delay(100); // wait for interface config
+
+    // Activate the audio interface
+    setActivate(true);
+    delay(100);
+
+    write(WM8731_REG_POWERDOWN, 0x02); // power up outputs
+    regArray[WM8731_REG_POWERDOWN] = 0x02;
+    delay(500); // wait for output to power up
+
+    delay(100); // wait for mute ramp
+
+}
+
 } /* namespace BALibrary */