diff --git a/firmware/baseband/audio_dma.cpp b/firmware/baseband/audio_dma.cpp
index 60e85096e..1f2828558 100644
--- a/firmware/baseband/audio_dma.cpp
+++ b/firmware/baseband/audio_dma.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
@@ -228,7 +229,7 @@ buffer_t rx_empty_buffer() {
 	if( next_lli ) {
 		const size_t next_index = next_lli - &lli_rx_loop[0];
 		const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
-		return { reinterpret_cast<sample_t*>(lli_rx_loop[free_index].srcaddr), transfer_samples };
+		return { reinterpret_cast<sample_t*>(lli_rx_loop[free_index].destaddr), transfer_samples };
 	} else {
 		return { nullptr, 0 };
 	}
diff --git a/firmware/baseband/audio_dma.hpp b/firmware/baseband/audio_dma.hpp
index 863a4f396..5fe16a27c 100644
--- a/firmware/baseband/audio_dma.hpp
+++ b/firmware/baseband/audio_dma.hpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
  *
  * This file is part of PortaPack.
  *
diff --git a/firmware/baseband/audio_input.cpp b/firmware/baseband/audio_input.cpp
new file mode 100644
index 000000000..4ebfc507c
--- /dev/null
+++ b/firmware/baseband/audio_input.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "audio_input.hpp"
+
+#include "portapack_shared_memory.hpp"
+
+#include "audio_dma.hpp"
+
+#include "message.hpp"
+
+#include <cstdint>
+#include <cstddef>
+#include <array>
+
+void AudioInput::configure(
+	const iir_biquad_config_t& hpf_config,
+	const float squelch_threshold
+) {
+	//hpf.configure(hpf_config);
+	//squelch.set_threshold(squelch_threshold);
+}
+
+void AudioInput::read_audio_buffer(buffer_s16_t& audio) {
+	//std::array<int16_t, 32> audio_int;
+
+	auto audio_buffer = audio::dma::rx_empty_buffer();
+	
+	for(size_t i=0; i<audio_buffer.count; i++) {
+		//const int32_t sample_int = audio.p[i] * k;
+		//const int32_t sample_saturated = __SSAT(sample_int, 16);
+		audio.p[i] = audio_buffer.p[i].left;
+		//audio_int[i] = sample_saturated;
+	}
+	/*if( stream && send_to_fifo ) {
+		stream->write(audio_int.data(), audio_buffer.count * sizeof(audio_int[0]));
+	}*/
+
+	//feed_audio_stats(audio);
+}
diff --git a/firmware/baseband/audio_input.hpp b/firmware/baseband/audio_input.hpp
new file mode 100644
index 000000000..963e09c39
--- /dev/null
+++ b/firmware/baseband/audio_input.hpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __AUDIO_INPUT_H__
+#define __AUDIO_INPUT_H__
+
+#include "dsp_types.hpp"
+
+#include "dsp_iir.hpp"
+#include "dsp_squelch.hpp"
+
+#include "stream_input.hpp"
+
+#include <cstdint>
+#include <memory>
+
+class AudioInput {
+public:
+	void configure(
+		const iir_biquad_config_t& hpf_config,
+		const float squelch_threshold = 0.0f
+	);
+
+	void read_audio_buffer(buffer_s16_t& audio);
+
+	/*void set_stream(std::unique_ptr<StreamInput> new_stream) {
+		stream = std::move(new_stream);
+	}*/
+
+private:
+	static constexpr float k = 32768.0f;
+	static constexpr float ki = 1.0f / k;
+
+	IIRBiquadFilter hpf { };
+	//FMSquelch squelch { };
+
+	//std::unique_ptr<StreamInput> stream { };
+
+	//AudioStatsCollector audio_stats { };
+};
+
+#endif/*__AUDIO_INPUT_H__*/
diff --git a/firmware/baseband/proc_mictx.cpp b/firmware/baseband/proc_mictx.cpp
new file mode 100644
index 000000000..1345a062d
--- /dev/null
+++ b/firmware/baseband/proc_mictx.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ * 
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "proc_mictx.hpp"
+#include "portapack_shared_memory.hpp"
+#include "sine_table_int8.hpp"
+#include "event_m4.hpp"
+
+#include <cstdint>
+
+void MicTXProcessor::execute(const buffer_c8_t& buffer){
+
+	// This is called at 1536000/2048 = 750Hz
+	
+	if (!configured) return;
+	
+	audio_input.read_audio_buffer(audio_buffer);
+
+	for (size_t i = 0; i<buffer.count; i++) {
+		
+		sample = audio_buffer.p[i >> 6] >> 8;
+		
+		power += (sample < 0) ? -sample : sample;
+		
+		if (!as) {
+			as = divider;
+			level_message.value = power / (divider / 4);
+			shared_memory.application_queue.push(level_message);
+			power = 0;
+		} else {
+			as--;
+		}
+		
+		if (ctcss_enabled) {
+			ctcss_sample = sine_table_i8[(ctcss_phase & 0xFF000000U) >> 24];
+			sample_mixed = ((sample * 205) + (ctcss_sample * 50)) / 256;	// ~20%
+			ctcss_phase += ctcss_phase_inc;
+		} else {
+			sample_mixed = sample;
+		}
+		
+		// FM
+		delta = sample_mixed * fm_delta;
+		
+		phase += delta;
+		sphase = phase + (64 << 24);
+
+		re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
+		im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
+		
+		buffer.p[i] = {re, im};
+	}
+}
+
+void MicTXProcessor::on_message(const Message* const msg) {
+	const auto message = *reinterpret_cast<const AudioTXConfigMessage*>(msg);
+	
+	switch(msg->id) {
+		case Message::ID::AudioTXConfig:
+			fm_delta = message.fm_delta * (0xFFFFFFULL / 1536000);
+			divider = message.divider;
+			ctcss_enabled = message.ctcss_enabled;
+			ctcss_phase_inc = message.ctcss_phase_inc;
+
+			configured = true;
+			break;
+
+		default:
+			break;
+	}
+}
+
+int main() {
+	EventDispatcher event_dispatcher { std::make_unique<MicTXProcessor>() };
+	event_dispatcher.run();
+	return 0;
+}
diff --git a/firmware/baseband/proc_mictx.hpp b/firmware/baseband/proc_mictx.hpp
new file mode 100644
index 000000000..99f59b35d
--- /dev/null
+++ b/firmware/baseband/proc_mictx.hpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 Furrtek
+ * 
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __PROC_MICTX_H__
+#define __PROC_MICTX_H__
+
+#include "audio_input.hpp"
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+
+class MicTXProcessor : public BasebandProcessor {
+public:
+	void execute(const buffer_c8_t& buffer) override;
+	
+	void on_message(const Message* const msg) override;
+
+private:
+	bool configured = false;
+	
+	BasebandThread baseband_thread { 1536000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
+	
+	int16_t audio_data[64];
+	buffer_s16_t audio_buffer {
+		audio_data,
+		sizeof(int16_t) * 64
+	};
+	
+	AudioInput audio_input { };
+	
+	uint32_t divider { };
+	uint32_t as { 0 };
+	uint32_t fm_delta { 0 };
+	bool ctcss_enabled { false };
+	uint32_t ctcss_phase_inc { };
+	uint32_t ctcss_phase { 0 }, phase { 0 }, sphase { 0 };
+	int32_t ctcss_sample { 0 }, sample { 0 }, sample_mixed { }, delta { };
+	uint64_t power { 0 };
+	
+	int8_t re { 0 }, im { 0 };
+	
+	AudioLevelMessage level_message { };
+};
+
+#endif