diff --git a/firmware/application/CMakeLists.txt b/firmware/application/CMakeLists.txt
index 3d168011b..0892fda43 100644
--- a/firmware/application/CMakeLists.txt
+++ b/firmware/application/CMakeLists.txt
@@ -155,6 +155,7 @@ set(CPPSRC
 	ui_afsksetup.cpp
 	ui_alphanum.cpp
 	ui_audio.cpp
+	ui_audiotx.cpp
 	ui_baseband_stats_view.cpp
 	ui_bht_tx.cpp
 	ui_channel.cpp
diff --git a/firmware/application/audio.cpp b/firmware/application/audio.cpp
index ac04e106c..952f51ae7 100644
--- a/firmware/application/audio.cpp
+++ b/firmware/application/audio.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
@@ -41,7 +42,7 @@ constexpr i2s::ConfigTX i2s0_config_tx {
 		.mono = 0,
 		.stop = 1,
 		.reset = 0,
-		.ws_sel = 0,
+		.ws_sel = 0,			// Master
 		.ws_halfperiod = 0x0f,
 		.mute = 1,
 	},
@@ -65,7 +66,7 @@ constexpr i2s::ConfigRX i2s0_config_rx {
 		.mono = 0,
 		.stop = 1,
 		.reset = 0,
-		.ws_sel = 1,
+		.ws_sel = 0,			// Master
 		.ws_halfperiod = 0x0f,
 	},
 	.rxrate = i2s::MCLKRate {
@@ -103,6 +104,18 @@ WM8731 audio_codec { i2c0, wm8731_i2c_address };
 
 } /* namespace */
 
+namespace input {
+
+void start() {
+	i2s::i2s0::rx_start();
+}
+
+void stop() {
+	i2s::i2s0::rx_stop();
+}
+
+} /* namespace input */
+
 namespace output {
 
 void start() {
diff --git a/firmware/application/audio.hpp b/firmware/application/audio.hpp
index e3d7544f5..926bf1f80 100644
--- a/firmware/application/audio.hpp
+++ b/firmware/application/audio.hpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
@@ -38,6 +39,13 @@ void unmute();
 
 } /* namespace output */
 
+namespace input {
+
+void start();
+void stop();
+
+} /* namespace input */
+
 namespace headphone {
 
 volume_range_t volume_range();
diff --git a/firmware/application/ctcss.cpp b/firmware/application/ctcss.cpp
index 7eccc5e2f..e44a254ce 100644
--- a/firmware/application/ctcss.cpp
+++ b/firmware/application/ctcss.cpp
@@ -25,7 +25,7 @@
 const ctcss_tone ctcss_tones[CTCSS_TONES_NB] = {
 	{ "XZ", 0, 67.000 },
 	{ "WZ", 1, 69.400 },
-	{ "XA", 39, 71.900 },
+	{ "XA", 2, 71.900 },
 	{ "WA", 3, 74.400 },
 	{ "XB", 4, 77.000 },
 	{ "WB", 5, 79.700 },
diff --git a/firmware/application/ui_audiotx.cpp b/firmware/application/ui_audiotx.cpp
index ca4454a16..b4df39bdb 100644
--- a/firmware/application/ui_audiotx.cpp
+++ b/firmware/application/ui_audiotx.cpp
@@ -21,15 +21,12 @@
 
 #include "ui_audiotx.hpp"
 
-#include "ch.h"
-
+#include "baseband_api.hpp"
 #include "ui_alphanum.hpp"
-#include "ff.h"
-#include "hackrf_gpio.hpp"
+#include "audio.hpp"
 #include "portapack.hpp"
-#include "radio.hpp"
-
-#include "hackrf_hal.hpp"
+#include "pins.hpp"
+#include "string_format.hpp"
 #include "portapack_shared_memory.hpp"
 
 #include <cstring>
@@ -42,6 +39,38 @@ void AudioTXView::focus() {
 	button_transmit.focus();
 }
 
+void AudioTXView::paint(Painter& painter) {
+	_painter = &painter;
+}
+
+void AudioTXView::draw_vumeter() {
+	uint32_t bar;
+	Color color;
+	bool lit = true;
+	uint32_t bar_level = audio_level / 15;
+	
+	if (bar_level > 16) bar_level = 16;
+	
+	for (bar = 0; bar < 16; bar++) {
+		if (bar >= bar_level)
+			lit = false;
+		
+		if (bar < 11)
+			color = lit ? Color::green() : Color::dark_green();
+		else if ((bar >= 11) && (bar < 13))
+			color = lit ? Color::yellow() : Color::dark_yellow();
+		else if ((bar >= 13) && (bar < 15))
+			color = lit ? Color::orange() : Color::dark_orange();
+		else
+			color = lit ? Color::red() : Color::dark_red();
+		
+		_painter->fill_rectangle({ 100, (Coord)(210 - (bar * 12)), 40, 10 }, color);
+	}
+	
+	//text_power.set(to_string_hex(LPC_I2S0->STATE, 8) + " " + to_string_dec_uint(audio_level) + "  ");
+	text_power.set(to_string_dec_uint(audio_level) + "  ");
+}
+
 void AudioTXView::on_tuning_frequency_changed(rf::Frequency f) {
 	transmitter_model.set_tuning_frequency(f);
 }
@@ -50,10 +79,14 @@ AudioTXView::AudioTXView(
 	NavigationView& nav
 )
 {
+	pins[P6_2].mode(3);		// I2S0_RX_SDA !
+	
+	baseband::run_image(portapack::spi_flash::image_tag_mic_tx);
+	
 	transmitter_model.set_tuning_frequency(92200000);
 		
 	add_children({
-		&text_title,
+		&text_power,
 		&field_frequency,
 		&button_transmit,
 		&button_exit
@@ -74,22 +107,32 @@ AudioTXView::AudioTXView(
 	};
 	
 	button_transmit.on_select = [](Button&){
-		transmitter_model.set_baseband_configuration({
-			.mode = 1,
-			.sampling_rate = 1536000,
-			.decimation_factor = 1,
-		});
+		transmitter_model.set_sampling_rate(1536000U);
 		transmitter_model.set_rf_amp(true);
+		transmitter_model.set_lna(40);
+		transmitter_model.set_vga(40);
+		transmitter_model.set_baseband_bandwidth(1750000);
 		transmitter_model.enable();
+		
+		baseband::set_audiotx_data(
+			76800,		// 20Hz level update
+			10000,		// 10kHz bw
+			false,
+			0
+		);
 	};
 
 	button_exit.on_select = [&nav](Button&){
 		nav.pop();
 	};
+	
+	audio::set_rate(audio::Rate::Hz_24000);
+	audio::input::start();
 }
 
 AudioTXView::~AudioTXView() {
 	transmitter_model.disable();
+	baseband::shutdown();
 }
 
 }
diff --git a/firmware/application/ui_audiotx.hpp b/firmware/application/ui_audiotx.hpp
index c4c41e7ad..607481d64 100644
--- a/firmware/application/ui_audiotx.hpp
+++ b/firmware/application/ui_audiotx.hpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
@@ -19,16 +20,15 @@
  * Boston, MA 02110-1301, USA.
  */
 
+#ifndef __UI_AUDIOTX_H__
+#define __UI_AUDIOTX_H__
+
 #include "ui.hpp"
+#include "hal.h"
 #include "ui_widget.hpp"
-#include "ui_painter.hpp"
-#include "ui_menu.hpp"
 #include "ui_navigation.hpp"
 #include "ui_font_fixed_8x16.hpp"
-#include "clock_manager.hpp"
 #include "message.hpp"
-#include "rf_path.hpp"
-#include "max2837.hpp"
 #include "volume.hpp"
 #include "ui_receiver.hpp"
 #include "transmitter_model.hpp"
@@ -40,29 +40,58 @@ public:
 	AudioTXView(NavigationView& nav);
 	~AudioTXView();
 
+	AudioTXView(const AudioTXView&) = delete;
+	AudioTXView(AudioTXView&&) = delete;
+	AudioTXView& operator=(const AudioTXView&) = delete;
+	AudioTXView& operator=(AudioTXView&&) = delete;
+	
 	void focus() override;
+	void paint(Painter& painter) override;
+	
+	std::string title() const override { return "Microphone TX"; };
 
 private:
+	void draw_vumeter();
 	void on_tuning_frequency_changed(rf::Frequency f);
 	
-	FrequencyField field_frequency {
-		{ 5 * 8, 3 * 16 },
+	uint32_t audio_level { 0 };
+	Painter * _painter { };
+	
+	Text text_power {
+		{ 6 * 8, 28 * 8, 16 * 8, 16 },
+		"-"
 	};
 	
-	Text text_title {
-		{ 76, 64, 88, 16 },
-		"Audio TX"
+	FrequencyField field_frequency {
+		{ 6 * 8, 30 * 8 },
 	};
 	
 	Button button_transmit {
-		{ 72, 130, 96, 32 },
+		{ 1 * 8, 33 * 8, 12 * 8, 32 },
 		"Transmit"
 	};
 	
 	Button button_exit {
-		{ 72, 270, 96, 32 },
+		{ 16 * 8, 33 * 8, 12 * 8, 32 },
 		"Exit"
 	};
+	
+	MessageHandlerRegistration message_handler_lcd_sync {
+		Message::ID::DisplayFrameSync,
+		[this](const Message* const) {
+			this->draw_vumeter();
+		}
+	};
+	
+	MessageHandlerRegistration message_handler_audio_level {
+		Message::ID::AudioLevel,
+		[this](const Message* const p) {
+			const auto message = static_cast<const AudioLevelMessage*>(p);
+			this->audio_level = message->value;
+		}
+	};
 };
 
 } /* namespace ui */
+
+#endif/*__UI_AUDIOTX_H__*/
diff --git a/firmware/application/ui_handwrite.cpp b/firmware/application/ui_handwrite.cpp
index 1ca4f6059..d8575753b 100644
--- a/firmware/application/ui_handwrite.cpp
+++ b/firmware/application/ui_handwrite.cpp
@@ -31,7 +31,7 @@
 using namespace portapack;
 
 namespace ui {
-	
+
 void HandWriteView::paint(Painter& painter) {
 	_painter = &painter;
 }
diff --git a/firmware/application/ui_navigation.cpp b/firmware/application/ui_navigation.cpp
index 678b17147..43e945037 100644
--- a/firmware/application/ui_navigation.cpp
+++ b/firmware/application/ui_navigation.cpp
@@ -33,6 +33,7 @@
 
 #include "ui_about.hpp"
 #include "ui_adsbtx.hpp"
+#include "ui_audiotx.hpp"
 #include "ui_bht_tx.hpp"
 #include "ui_closecall.hpp"
 #include "ui_cw.hpp"
@@ -321,9 +322,9 @@ TransmitterCodedMenuView::TransmitterCodedMenuView(NavigationView& nav) {
 TransmitterAudioMenuView::TransmitterAudioMenuView(NavigationView& nav) {
 	add_items<4>({ {
 		{ "Soundboard", 			ui::Color::green(), &bitmap_icon_soundboard,	[&nav](){ nav.push<SoundBoardView>(); } },
-		{ "Numbers station",		ui::Color::green(),	&bitmap_icon_numbers,	[&nav](){ nav.push<NumbersStationView>(); } },
-		{ "Microphone", 			ui::Color::grey(),	&bitmap_icon_microphone,	[&nav](){ nav.push<NotImplementedView>(); } },
-		{ "Whistle", 				ui::Color::yellow(),&bitmap_icon_whistle,	[&nav](){ nav.push<WhistleView>(); } },
+		{ "Numbers station",		ui::Color::orange(),&bitmap_icon_numbers,		[&nav](){ nav.push<NumbersStationView>(); } },
+		{ "Microphone", 			ui::Color::orange(),&bitmap_icon_microphone,	[&nav](){ nav.push<AudioTXView>(); } },
+		{ "Whistle", 				ui::Color::yellow(),&bitmap_icon_whistle,		[&nav](){ nav.push<WhistleView>(); } },
 	} });
 	on_left = [&nav](){ nav.pop(); };
 }
diff --git a/firmware/application/ui_navigation.hpp b/firmware/application/ui_navigation.hpp
index 8bb2daf95..aa3a98ad6 100644
--- a/firmware/application/ui_navigation.hpp
+++ b/firmware/application/ui_navigation.hpp
@@ -172,7 +172,7 @@ public:
 private:
 	Text text_info {
 		{ 5 * 8, 284, 20 * 8, 16 },
-		"shrbrnd-sig-ftk 2016"
+		"shrbrnd-sig-ftk 2017"
 	};
 	
 	Button button_done {
diff --git a/firmware/application/ui_soundboard.cpp b/firmware/application/ui_soundboard.cpp
index 66b571d04..adabeb8d4 100644
--- a/firmware/application/ui_soundboard.cpp
+++ b/firmware/application/ui_soundboard.cpp
@@ -181,8 +181,7 @@ void SoundBoardView::change_page(Button& button, const KeyEvent key) {
 			page--;
 			refresh_buttons(button.id);
 		}
-	}
-	if (button.screen_pos().x() > 120) {
+	} else if (button.screen_pos().x() > 120) {
 		if ((key == KeyEvent::Right) && (page < max_page - 1)) {
 			page++;
 			refresh_buttons(button.id);
@@ -194,9 +193,7 @@ SoundBoardView::SoundBoardView(
 	NavigationView& nav
 ) : nav_ (nav)
 {
-	using name_t = std::string;
-	using value_t = int32_t;
-	using option_t = std::pair<name_t, value_t>;
+	using option_t = std::pair<std::string, int32_t>;
 	using options_t = std::vector<option_t>;
 	options_t ctcss_options;
 	std::vector<std::filesystem::path> file_list;
@@ -278,6 +275,7 @@ SoundBoardView::SoundBoardView(
 		return false;
 	};
 
+	// Generate buttons
 	size_t n = 0;
 	for(auto& button : buttons) {
 		add_child(&button);
@@ -294,7 +292,7 @@ SoundBoardView::SoundBoardView(
 	refresh_buttons(0);
 	
 	check_loop.set_value(false);
-	number_bw.set_value(15);
+	number_bw.set_value(12);
 
 	field_frequency.set_value(transmitter_model.tuning_frequency());
 	field_frequency.set_step(10000);
diff --git a/firmware/baseband/CMakeLists.txt b/firmware/baseband/CMakeLists.txt
index bf452fefb..9efe1bda9 100644
--- a/firmware/baseband/CMakeLists.txt
+++ b/firmware/baseband/CMakeLists.txt
@@ -129,6 +129,7 @@ set(CPPSRC
 	rssi_thread.cpp
 	audio_compressor.cpp
 	audio_output.cpp
+	audio_input.cpp
 	audio_dma.cpp
 	audio_stats_collector.cpp
 	${COMMON}/utility.cpp
@@ -365,6 +366,13 @@ set(MODE_CPPSRC
 )
 DeclareTargets(PATX audio_tx)
 
+### Microphone transmit
+
+set(MODE_CPPSRC
+	proc_mictx.cpp
+)
+DeclareTargets(PMTX mic_tx)
+
 ### AFSK
 
 set(MODE_CPPSRC