diff --git a/damc/damc_simple_lib/AudioProcessor.cpp b/damc/damc_simple_lib/AudioProcessor.cpp
index 9ccad64..0a43cac 100644
--- a/damc/damc_simple_lib/AudioProcessor.cpp
+++ b/damc/damc_simple_lib/AudioProcessor.cpp
@@ -55,6 +55,7 @@ AudioProcessor::AudioProcessor(uint32_t numChannels, uint32_t sampleRate, size_t
           {&oscRoot, "timePerLoopFastTimer"},
           {&oscRoot, "timePerLoopOscInput"},
       },
+      oscEnableMicBias(&oscRoot, "enableMicBias", true),
       fastMemoryAvailable(&oscRoot, "fastMemoryAvailable"),
       fastMemoryUsed(&oscRoot, "fastMemoryUsed"),
       slowMemoryAvailable(&oscRoot, "memoryAvailable"),
@@ -69,6 +70,7 @@ AudioProcessor::AudioProcessor(uint32_t numChannels, uint32_t sampleRate, size_t
 	serialClient.init();
 	controls.init();
 	oscStatePersist.init();
+	oscEnableMicBias.addChangeCallback([](bool enable) { CodecAudio::instance.setMicBias(enable); });
 }
 
 AudioProcessor::~AudioProcessor() {}
diff --git a/damc/damc_simple_lib/AudioProcessor.h b/damc/damc_simple_lib/AudioProcessor.h
index 1bdfbca..5a533bf 100644
--- a/damc/damc_simple_lib/AudioProcessor.h
+++ b/damc/damc_simple_lib/AudioProcessor.h
@@ -11,6 +11,7 @@
 #include <Osc/OscDynamicVariable.h>
 #include <Osc/OscFixedArray.h>
 #include <Osc/OscReadOnlyVariable.h>
+#include <Osc/OscVariable.h>
 #include <OscRoot.h>
 #include <OscStatePersist.h>
 #include <array>
@@ -70,6 +71,7 @@ class AudioProcessor {
 
 	OscReadOnlyVariable<int32_t> oscTimeMeasure[TMI_NUMBER];
 	OscReadOnlyVariable<int32_t> oscTimeMeasureMaxPerLoop[TMI_NUMBER];
+	OscVariable<bool> oscEnableMicBias;
 
 	OscDynamicVariable<int32_t> fastMemoryAvailable;
 	OscDynamicVariable<int32_t> fastMemoryUsed;
diff --git a/damc/damc_simple_lib/CodecAudio.cpp b/damc/damc_simple_lib/CodecAudio.cpp
index 024b043..a18d221 100644
--- a/damc/damc_simple_lib/CodecAudio.cpp
+++ b/damc/damc_simple_lib/CodecAudio.cpp
@@ -72,3 +72,9 @@ uint32_t CodecAudio::getDMAInPos() {
 bool CodecAudio::onFastTimer() {
 	return false;
 }
+
+void CodecAudio::setMicBias(bool enable) {
+	if(useTlvAsMclkMaster) {
+		codecDamcHATInit.setMicBias(enable);
+	}
+}
\ No newline at end of file
diff --git a/damc/damc_simple_lib/CodecAudio.h b/damc/damc_simple_lib/CodecAudio.h
index 767253c..350fb03 100644
--- a/damc/damc_simple_lib/CodecAudio.h
+++ b/damc/damc_simple_lib/CodecAudio.h
@@ -25,6 +25,8 @@ class CodecAudio {
 
 	bool onFastTimer();
 
+	void setMicBias(bool enable);
+
 	static CodecAudio instance;
 
 protected:
diff --git a/damc/damc_simple_lib/CodecDamcHATInit.cpp b/damc/damc_simple_lib/CodecDamcHATInit.cpp
index ad32cdb..cd79857 100644
--- a/damc/damc_simple_lib/CodecDamcHATInit.cpp
+++ b/damc/damc_simple_lib/CodecDamcHATInit.cpp
@@ -364,7 +364,7 @@ void CodecDamcHATInit::init_codec() {
 		writeI2c(55, 0b00000001);  // Right MICPGA Positive Terminal Input Routing Configuration Register
 		// IN1L (SGND) to Right MICPGA-
 		writeI2c(57, 0b00010000);  // Right MICPGA Negative Terminal Input Routing Configuration Register
-	} else {
+	} else if(0) {
 		// IN2L to Left MICPGA+
 		writeI2c(52, 0b00010000);  // Left MICPGA Positive Terminal Input Routing Configuration Register
 		// CM (GND) to Left MICPGA-
@@ -374,6 +374,16 @@ void CodecDamcHATInit::init_codec() {
 		writeI2c(55, 0b00000001);  // Right MICPGA Positive Terminal Input Routing Configuration Register
 		// CM (GND) to Right MICPGA-
 		writeI2c(57, 0b01000000);  // Right MICPGA Negative Terminal Input Routing Configuration Register
+	} else {
+		// IN1L (SGND) to Left MICPGA+
+		writeI2c(52, 0b01000000);  // Left MICPGA Positive Terminal Input Routing Configuration Register
+		// CM (GND) to Left MICPGA-
+		writeI2c(54, 0b01000000);  // Left MICPGA Negative Terminal Input Routing Configuration Register
+
+		// IN2R (SGND) to Right MICPGA+
+		writeI2c(55, 0b00010000);  // Right MICPGA Positive Terminal Input Routing Configuration Register
+		// CM (GND) to Right MICPGA-
+		writeI2c(57, 0b01000000);  // Right MICPGA Negative Terminal Input Routing Configuration Register
 	}
 
 	writeI2c(58, 0b00001100);  // Floating Input Configuration Register, IN3 weakly driven
@@ -458,4 +468,14 @@ void CodecDamcHATInit::setReset(bool value) {
 void CodecDamcHATInit::setTpaEn(bool value) {
 	GPIO_PinState gpio_value = value ? GPIO_PIN_SET : GPIO_PIN_RESET;
 	HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, gpio_value);
+}
+
+void CodecDamcHATInit::setMicBias(bool enable) {
+	// Select page 1
+	writeI2c(0, 1);
+	if(enable) {
+		writeI2c(51, 0b01010000);
+	} else {
+		writeI2c(51, 0b00010000);
+	}
 }
\ No newline at end of file
diff --git a/damc/damc_simple_lib/CodecDamcHATInit.h b/damc/damc_simple_lib/CodecDamcHATInit.h
index e2ec58c..cad82c0 100644
--- a/damc/damc_simple_lib/CodecDamcHATInit.h
+++ b/damc/damc_simple_lib/CodecDamcHATInit.h
@@ -25,6 +25,8 @@ class CodecDamcHATInit {
 	uint16_t getTxRemainingCount();
 	uint16_t getRxRemainingCount();
 
+	void setMicBias(bool enable);
+
 private:
 	void writeI2c(uint8_t address, uint8_t value);
 	uint8_t readI2c(uint8_t address);