diff --git a/src/config.cpp b/src/config.cpp
index a31e1a46..0242548a 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -38,7 +38,11 @@ void CConfig::Load (void)
 	m_SoundDevice = m_Properties.GetString ("SoundDevice", "pwm");
 
 	m_nSampleRate = m_Properties.GetNumber ("SampleRate", 48000);
+#ifdef ARM_ALLOW_MULTI_CORE
 	m_nChunkSize = m_Properties.GetNumber ("ChunkSize", m_SoundDevice == "hdmi" ? 384*6 : 256);
+#else
+	m_nChunkSize = m_Properties.GetNumber ("ChunkSize", m_SoundDevice == "hdmi" ? 384*6 : 1024);
+#endif
 	m_nDACI2CAddress = m_Properties.GetNumber ("DACI2CAddress", 0);
 
 	m_nMIDIBaudRate = m_Properties.GetNumber ("MIDIBaudRate", 31250);
diff --git a/src/config.h b/src/config.h
index 18467434..f94e62ed 100644
--- a/src/config.h
+++ b/src/config.h
@@ -25,12 +25,27 @@
 
 #include <fatfs/ff.h>
 #include <Properties/propertiesfatfsfile.h>
+#include <circle/sysconfig.h>
 #include <string>
 
 class CConfig		// Configuration for MiniDexed
 {
 public:
-	static const unsigned MaxNotes = 16;		// polyphony
+#ifndef ARM_ALLOW_MULTI_CORE
+	static const unsigned ToneGenerators = 1;
+#else
+	static const unsigned TGsCore1 = 2;		// process 2 TGs on core 1
+	static const unsigned TGsCore23 = 3;		// process 3 TGs on core 2 and 3 each
+	static const unsigned ToneGenerators = TGsCore1 + 2*TGsCore23;
+#endif
+
+#if RASPPI == 1
+	static const unsigned MaxNotes = 8;		// polyphony
+#else
+	static const unsigned MaxNotes = 16;
+#endif
+
+	static const unsigned MaxChunkSize = 4096;
 
 #if RASPPI <= 3
 	static const unsigned MaxUSBMIDIDevices = 2;
diff --git a/src/dexedadapter.h b/src/dexedadapter.h
index 3e85c1ba..7f2badc5 100644
--- a/src/dexedadapter.h
+++ b/src/dexedadapter.h
@@ -70,6 +70,13 @@ class CDexedAdapter : public Dexed
 		m_SpinLock.Release ();
 	}
 
+	void setSustain (bool sustain)
+	{
+		m_SpinLock.Acquire ();
+		Dexed::setSustain (sustain);
+		m_SpinLock.Release ();
+	}
+
 private:
 	CSpinLock m_SpinLock;
 };
diff --git a/src/mididevice.cpp b/src/mididevice.cpp
index d5559dd2..33032acf 100644
--- a/src/mididevice.cpp
+++ b/src/mididevice.cpp
@@ -45,6 +45,10 @@ CMIDIDevice::CMIDIDevice (CMiniDexed *pSynthesizer, CConfig *pConfig)
 :	m_pSynthesizer (pSynthesizer),
 	m_pConfig (pConfig)
 {
+	for (unsigned nTG = 0; nTG < CConfig::ToneGenerators; nTG++)
+	{
+		m_ChannelMap[nTG] = Disabled;
+	}
 }
 
 CMIDIDevice::~CMIDIDevice (void)
@@ -52,6 +56,18 @@ CMIDIDevice::~CMIDIDevice (void)
 	m_pSynthesizer = 0;
 }
 
+void CMIDIDevice::SetChannel (u8 ucChannel, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	m_ChannelMap[nTG] = ucChannel;
+}
+
+u8 CMIDIDevice::GetChannel (unsigned nTG) const
+{
+	assert (nTG < CConfig::ToneGenerators);
+	return m_ChannelMap[nTG];
+}
+
 void CMIDIDevice::MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsigned nCable)
 {
 	assert (m_pSynthesizer != 0);
@@ -67,17 +83,17 @@ void CMIDIDevice::MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsign
 			if (   pMessage[0] != MIDI_TIMING_CLOCK
 			    && pMessage[0] != MIDI_ACTIVE_SENSING)
 			{
-				printf ("MIDI %u: %02X\n", nCable, (unsigned) pMessage[0]);
+				printf ("MIDI%u: %02X\n", nCable, (unsigned) pMessage[0]);
 			}
 			break;
 
 		case 2:
-			printf ("MIDI %u: %02X %02X\n", nCable,
+			printf ("MIDI%u: %02X %02X\n", nCable,
 				(unsigned) pMessage[0], (unsigned) pMessage[1]);
 			break;
 
 		case 3:
-			printf ("MIDI %u: %02X %02X %02X\n", nCable,
+			printf ("MIDI%u: %02X %02X %02X\n", nCable,
 				(unsigned) pMessage[0], (unsigned) pMessage[1],
 				(unsigned) pMessage[2]);
 			break;
@@ -89,87 +105,93 @@ void CMIDIDevice::MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsign
 		return;
 	}
 
-	u8 ucStatus    = pMessage[0];
-	// TODO: u8 ucChannel   = ucStatus & 0x0F;
-	u8 ucType      = ucStatus >> 4;
-	u8 ucKeyNumber = pMessage[1];
-	u8 ucVelocity  = pMessage[2];
+	u8 ucStatus  = pMessage[0];
+	u8 ucChannel = ucStatus & 0x0F;
+	u8 ucType    = ucStatus >> 4;
 
-	switch (ucType)
+	for (unsigned nTG = 0; nTG < CConfig::ToneGenerators; nTG++)
 	{
-	case MIDI_NOTE_ON:
-		if (nLength < 3)
+		if (   m_ChannelMap[nTG] == ucChannel
+		    || m_ChannelMap[nTG] == OmniMode)
 		{
-			break;
-		}
-
-		if (ucVelocity > 0)
-		{
-			if (ucVelocity <= 127)
+			switch (ucType)
 			{
-				m_pSynthesizer->keydown (ucKeyNumber, ucVelocity);
+			case MIDI_NOTE_ON:
+				if (nLength < 3)
+				{
+					break;
+				}
+
+				if (pMessage[2] > 0)
+				{
+					if (pMessage[2] <= 127)
+					{
+						m_pSynthesizer->keydown (pMessage[1],
+									 pMessage[2], nTG);
+					}
+				}
+				else
+				{
+					m_pSynthesizer->keyup (pMessage[1], nTG);
+				}
+				break;
+
+			case MIDI_NOTE_OFF:
+				if (nLength < 3)
+				{
+					break;
+				}
+
+				m_pSynthesizer->keyup (pMessage[1], nTG);
+				break;
+
+			case MIDI_CONTROL_CHANGE:
+				if (nLength < 3)
+				{
+					break;
+				}
+
+				switch (pMessage[1])
+				{
+				case MIDI_CC_MODULATION:
+					m_pSynthesizer->setModWheel (pMessage[2], nTG);
+					m_pSynthesizer->ControllersRefresh (nTG);
+					break;
+
+				case MIDI_CC_VOLUME:
+					m_pSynthesizer->SetVolume (pMessage[2], nTG);
+					break;
+
+				case MIDI_CC_BANK_SELECT_LSB:
+					m_pSynthesizer->BankSelectLSB (pMessage[2], nTG);
+					break;
+
+				case MIDI_CC_BANK_SUSTAIN:
+					m_pSynthesizer->setSustain (pMessage[2] >= 64, nTG);
+					break;
+				}
+				break;
+
+			case MIDI_PROGRAM_CHANGE:
+				m_pSynthesizer->ProgramChange (pMessage[1], nTG);
+				break;
+
+			case MIDI_PITCH_BEND: {
+				if (nLength < 3)
+				{
+					break;
+				}
+
+				s16 nValue = pMessage[1];
+				nValue |= (s16) pMessage[2] << 7;
+				nValue -= 0x2000;
+
+				m_pSynthesizer->setPitchbend (nValue, nTG);
+				} break;
+
+			default:
+				break;
 			}
 		}
-		else
-		{
-			m_pSynthesizer->keyup (ucKeyNumber);
-		}
-		break;
-
-	case MIDI_NOTE_OFF:
-		if (nLength < 3)
-		{
-			break;
-		}
-
-		m_pSynthesizer->keyup (ucKeyNumber);
-		break;
-
-	case MIDI_CONTROL_CHANGE:
-		if (nLength < 3)
-		{
-			break;
-		}
-
-		switch (pMessage[1])
-		{
-		case MIDI_CC_MODULATION:
-			m_pSynthesizer->setModWheel (pMessage[2]);
-			m_pSynthesizer->ControllersRefresh ();
-			break;
-
-		case MIDI_CC_VOLUME:
-			m_pSynthesizer->SetVolume (pMessage[2]);
-			break;
-
-		case MIDI_CC_BANK_SELECT_LSB:
-			m_pSynthesizer->BankSelectLSB (pMessage[2]);
-			break;
-
-		case MIDI_CC_BANK_SUSTAIN:
-			m_pSynthesizer->setSustain (pMessage[2] >= 64);
-			break;
-		}
-		break;
-
-	case MIDI_PROGRAM_CHANGE:
-		m_pSynthesizer->ProgramChange (pMessage[1]);
-		break;
-
-	case MIDI_PITCH_BEND: {
-		if (nLength < 3)
-		{
-			break;
-		}
-
-		s16 nValue = pMessage[1];
-		nValue |= (s16) pMessage[2] << 7;
-		nValue -= 0x2000;
-
-		m_pSynthesizer->setPitchbend (nValue);
-		} break;
-
-	default:
-		break;
 	}
 }
diff --git a/src/mididevice.h b/src/mididevice.h
index a595d1ea..166351dc 100644
--- a/src/mididevice.h
+++ b/src/mididevice.h
@@ -30,16 +30,30 @@ class CMiniDexed;
 
 class CMIDIDevice
 {
+public:
+	enum TChannel
+	{
+		Channels = 16,
+		OmniMode = Channels,
+		Disabled,
+		ChannelUnknown
+	};
+
 public:
 	CMIDIDevice (CMiniDexed *pSynthesizer, CConfig *pConfig);
 	~CMIDIDevice (void);
 
+	void SetChannel (u8 ucChannel, unsigned nTG);
+	u8 GetChannel (unsigned nTG) const;
+
 protected:
 	void MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsigned nCable = 0);
 
 private:
 	CMiniDexed *m_pSynthesizer;
 	CConfig *m_pConfig;
+
+	u8 m_ChannelMap[CConfig::ToneGenerators];
 };
 
 #endif
diff --git a/src/minidexed.cpp b/src/minidexed.cpp
index 4e4d8cfa..762cf3d6 100644
--- a/src/minidexed.cpp
+++ b/src/minidexed.cpp
@@ -31,13 +31,13 @@ LOGMODULE ("minidexed");
 
 CMiniDexed::CMiniDexed (CConfig *pConfig, CInterruptSystem *pInterrupt,
 			CGPIOManager *pGPIOManager, CI2CMaster *pI2CMaster)
-:	CDexedAdapter (CConfig::MaxNotes, pConfig->GetSampleRate ()),
+:
 #ifdef ARM_ALLOW_MULTI_CORE
 	CMultiCoreSupport (CMemorySystem::Get ()),
 #endif
 	m_pConfig (pConfig),
 	m_UI (this, pGPIOManager, pConfig),
-	m_PCKeyboard (this),
+	m_PCKeyboard (this, pConfig),
 	m_SerialMIDI (this, pInterrupt, pConfig),
 	m_bUseSerial (false),
 	m_pSoundDevice (0),
@@ -45,6 +45,18 @@ CMiniDexed::CMiniDexed (CConfig *pConfig, CInterruptSystem *pInterrupt,
 			 1000000U * pConfig->GetChunkSize ()/2 / pConfig->GetSampleRate ()),
 	m_bProfileEnabled (m_pConfig->GetProfileEnabled ())
 {
+	assert (m_pConfig);
+
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		m_nVoiceBankID[i] = 0;
+
+		m_pTG[i] = new CDexedAdapter (CConfig::MaxNotes, pConfig->GetSampleRate ());
+		assert (m_pTG[i]);
+
+		m_pTG[i]->activate ();
+	}
+
 	for (unsigned i = 0; i < CConfig::MaxUSBMIDIDevices; i++)
 	{
 		m_pMIDIKeyboard[i] = new CMIDIKeyboard (this, pConfig, i);
@@ -75,6 +87,13 @@ CMiniDexed::CMiniDexed (CConfig *pConfig, CInterruptSystem *pInterrupt,
 		m_pSoundDevice = new CPWMSoundBaseDevice (pInterrupt, pConfig->GetSampleRate (),
 							  pConfig->GetChunkSize ());
 	}
+
+#ifdef ARM_ALLOW_MULTI_CORE
+	for (unsigned nCore = 0; nCore < CORES; nCore++)
+	{
+		m_CoreStatus[nCore] = CoreStatusInit;
+	}
+#endif
 };
 
 bool CMiniDexed::Initialize (void)
@@ -96,14 +115,20 @@ bool CMiniDexed::Initialize (void)
 		m_bUseSerial = true;
 	}
 
-	activate ();
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+
+		SetVolume (100, i);
+		ProgramChange (0, i);
 
-	SetVolume (100);
-	ProgramChange (0);
-	setTranspose (24);
+		m_pTG[i]->setTranspose (24);
 
-	setPBController (12, 1);
-	setMWController (99, 7, 0);
+		m_pTG[i]->setPBController (12, 1);
+		m_pTG[i]->setMWController (99, 7, 0);
+	}
+
+	SetMIDIChannel (CMIDIDevice::OmniMode, 0);
 
 	// setup and start the sound device
 	if (!m_pSoundDevice->AllocateQueueFrames (m_pConfig->GetChunkSize ()))
@@ -161,13 +186,58 @@ void CMiniDexed::Process (bool bPlugAndPlayUpdated)
 
 void CMiniDexed::Run (unsigned nCore)
 {
+	assert (1 <= nCore && nCore < CORES);
+
 	if (nCore == 1)
 	{
-		while (1)
+		m_CoreStatus[nCore] = CoreStatusIdle;			// core 1 ready
+
+		// wait for cores 2 and 3 to be ready
+		for (unsigned nCore = 2; nCore < CORES; nCore++)
+		{
+			while (m_CoreStatus[nCore] != CoreStatusIdle)
+			{
+				// just wait
+			}
+		}
+
+		while (m_CoreStatus[nCore] != CoreStatusExit)
 		{
 			ProcessSound ();
 		}
 	}
+	else								// core 2 and 3
+	{
+		while (1)
+		{
+			m_CoreStatus[nCore] = CoreStatusIdle;		// ready to be kicked
+			while (m_CoreStatus[nCore] == CoreStatusIdle)
+			{
+				// just wait
+			}
+
+			// now kicked from core 1
+
+			if (m_CoreStatus[nCore] == CoreStatusExit)
+			{
+				m_CoreStatus[nCore] = CoreStatusUnknown;
+
+				break;
+			}
+
+			assert (m_CoreStatus[nCore] == CoreStatusBusy);
+
+			// process the TGs, assigned to this core (2 or 3)
+
+			assert (m_nFramesToProcess <= CConfig::MaxChunkSize);
+			unsigned nTG = CConfig::TGsCore1 + (nCore-2)*CConfig::TGsCore23;
+			for (unsigned i = 0; i < CConfig::TGsCore23; i++, nTG++)
+			{
+				assert (m_pTG[nTG]);
+				m_pTG[nTG]->getSamples (m_nFramesToProcess, m_OutputLevel[nTG]);
+			}
+		}
+	}
 }
 
 #endif
@@ -177,44 +247,158 @@ CSysExFileLoader *CMiniDexed::GetSysExFileLoader (void)
 	return &m_SysExFileLoader;
 }
 
-void CMiniDexed::BankSelectLSB (unsigned nBankLSB)
+void CMiniDexed::BankSelectLSB (unsigned nBankLSB, unsigned nTG)
 {
 	if (nBankLSB > 127)
 	{
 		return;
 	}
 
-	m_SysExFileLoader.SelectVoiceBank (nBankLSB);
+	assert (nTG < CConfig::ToneGenerators);
+	m_nVoiceBankID[nTG] = nBankLSB;
 
-	m_UI.BankSelected (nBankLSB);
+	m_UI.BankSelected (nBankLSB, nTG);
 }
 
-void CMiniDexed::ProgramChange (unsigned nProgram)
+void CMiniDexed::ProgramChange (unsigned nProgram, unsigned nTG)
 {
 	if (nProgram > 31)
 	{
 		return;
 	}
 
+	assert (nTG < CConfig::ToneGenerators);
 	uint8_t Buffer[156];
-	m_SysExFileLoader.GetVoice (nProgram, Buffer);
-	loadVoiceParameters (Buffer);
+	m_SysExFileLoader.GetVoice (m_nVoiceBankID[nTG], nProgram, Buffer);
 
-	m_UI.ProgramChanged (nProgram);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->loadVoiceParameters (Buffer);
+
+	m_UI.ProgramChanged (nProgram, nTG);
 }
 
-void CMiniDexed::SetVolume (unsigned nVolume)
+void CMiniDexed::SetVolume (unsigned nVolume, unsigned nTG)
 {
 	if (nVolume > 127)
 	{
 		return;
 	}
 
-	setGain (nVolume / 127.0);
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->setGain (nVolume / 127.0);
+
+	m_UI.VolumeChanged (nVolume, nTG);
+}
+
+void CMiniDexed::SetMIDIChannel (uint8_t uchChannel, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+
+	for (unsigned i = 0; i < CConfig::MaxUSBMIDIDevices; i++)
+	{
+		assert (m_pMIDIKeyboard[i]);
+		m_pMIDIKeyboard[i]->SetChannel (uchChannel, nTG);
+	}
+
+	m_PCKeyboard.SetChannel (uchChannel, nTG);
+
+	if (m_bUseSerial)
+	{
+		m_SerialMIDI.SetChannel (uchChannel, nTG);
+	}
+
+	m_UI.MIDIChannelChanged (uchChannel, nTG);
+}
+
+void CMiniDexed::keyup (int16_t pitch, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->keyup (pitch);
+}
+
+void CMiniDexed::keydown (int16_t pitch, uint8_t velocity, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->keydown (pitch, velocity);
+}
+
+void CMiniDexed::setSustain(bool sustain, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->setSustain (sustain);
+}
+
+void CMiniDexed::setModWheel (uint8_t value, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->setModWheel (value);
+}
+
+void CMiniDexed::setPitchbend (int16_t value, unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->setPitchbend (value);
+}
+
+void CMiniDexed::ControllersRefresh (unsigned nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->ControllersRefresh ();
+}
+
+std::string CMiniDexed::GetVoiceName (unsigned nTG)
+{
+	char VoiceName[11];
+	memset (VoiceName, 0, sizeof VoiceName);
+
+	assert (nTG < CConfig::ToneGenerators);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->setName (VoiceName);
+
+	std::string Result (VoiceName);
+
+	return Result;
+}
+
+#ifndef ARM_ALLOW_MULTI_CORE
+
+void CMiniDexed::ProcessSound (void)
+{
+	assert (m_pSoundDevice);
+
+	unsigned nFrames = m_nQueueSizeFrames - m_pSoundDevice->GetQueueFramesAvail ();
+	if (nFrames >= m_nQueueSizeFrames/2)
+	{
+		if (m_bProfileEnabled)
+		{
+			m_GetChunkTimer.Start ();
+		}
+
+		int16_t SampleBuffer[nFrames];
+		m_pTG[0]->getSamples (nFrames, SampleBuffer);
 
-	m_UI.VolumeChanged (nVolume);
+		if (   m_pSoundDevice->Write (SampleBuffer, sizeof SampleBuffer)
+		    != (int) sizeof SampleBuffer)
+		{
+			LOGERR ("Sound data dropped");
+		}
+
+		if (m_bProfileEnabled)
+		{
+			m_GetChunkTimer.Stop ();
+		}
+	}
 }
 
+#else	// #ifdef ARM_ALLOW_MULTI_CORE
+
 void CMiniDexed::ProcessSound (void)
 {
 	assert (m_pSoundDevice);
@@ -227,8 +411,48 @@ void CMiniDexed::ProcessSound (void)
 			m_GetChunkTimer.Start ();
 		}
 
+		m_nFramesToProcess = nFrames;
+
+		// kick secondary cores
+		for (unsigned nCore = 2; nCore < CORES; nCore++)
+		{
+			assert (m_CoreStatus[nCore] == CoreStatusIdle);
+			m_CoreStatus[nCore] = CoreStatusBusy;
+		}
+
+		// process the TGs assigned to core 1
+		assert (nFrames <= CConfig::MaxChunkSize);
+		for (unsigned i = 0; i < CConfig::TGsCore1; i++)
+		{
+			assert (m_pTG[i]);
+			m_pTG[i]->getSamples (nFrames, m_OutputLevel[i]);
+		}
+
+		// wait for cores 2 and 3 to complete their work
+		for (unsigned nCore = 2; nCore < CORES; nCore++)
+		{
+			while (m_CoreStatus[nCore] != CoreStatusIdle)
+			{
+				// just wait
+			}
+		}
+
+		// now mix the output of all TGs
 		int16_t SampleBuffer[nFrames];
-		getSamples (nFrames, SampleBuffer);
+		assert (CConfig::ToneGenerators == 8);
+		for (unsigned i = 0; i < nFrames; i++)
+		{
+			int32_t nSample =   m_OutputLevel[0][i]
+					  + m_OutputLevel[1][i]
+					  + m_OutputLevel[2][i]
+					  + m_OutputLevel[3][i]
+					  + m_OutputLevel[4][i]
+					  + m_OutputLevel[5][i]
+					  + m_OutputLevel[6][i]
+					  + m_OutputLevel[7][i];
+
+			SampleBuffer[i] = (int16_t) (nSample / CConfig::ToneGenerators);
+		}
 
 		if (   m_pSoundDevice->Write (SampleBuffer, sizeof SampleBuffer)
 		    != (int) sizeof SampleBuffer)
@@ -242,3 +466,5 @@ void CMiniDexed::ProcessSound (void)
 		}
 	}
 }
+
+#endif
diff --git a/src/minidexed.h b/src/minidexed.h
index 17ca610c..144e53b5 100644
--- a/src/minidexed.h
+++ b/src/minidexed.h
@@ -29,6 +29,7 @@
 #include "serialmididevice.h"
 #include "perftimer.h"
 #include <stdint.h>
+#include <string>
 #include <circle/types.h>
 #include <circle/interrupt.h>
 #include <circle/gpiomanager.h>
@@ -36,9 +37,9 @@
 #include <circle/multicore.h>
 #include <circle/soundbasedevice.h>
 
-class CMiniDexed : public CDexedAdapter
+class CMiniDexed
 #ifdef ARM_ALLOW_MULTI_CORE
-	, public CMultiCoreSupport
+:	public CMultiCoreSupport
 #endif
 {
 public:
@@ -55,16 +56,41 @@ class CMiniDexed : public CDexedAdapter
 
 	CSysExFileLoader *GetSysExFileLoader (void);
 
-	void BankSelectLSB (unsigned nBankLSB);
-	void ProgramChange (unsigned nProgram);
-	void SetVolume (unsigned nVolume);
+	void BankSelectLSB (unsigned nBankLSB, unsigned nTG);
+	void ProgramChange (unsigned nProgram, unsigned nTG);
+	void SetVolume (unsigned nVolume, unsigned nTG);
+	void SetMIDIChannel (uint8_t uchChannel, unsigned nTG);
+
+	void keyup (int16_t pitch, unsigned nTG);
+	void keydown (int16_t pitch, uint8_t velocity, unsigned nTG);
+
+	void setSustain (bool sustain, unsigned nTG);
+	void setModWheel (uint8_t value, unsigned nTG);
+	void setPitchbend (int16_t value, unsigned nTG);
+	void ControllersRefresh (unsigned nTG);
+
+	std::string GetVoiceName (unsigned nTG);
 
 private:
 	void ProcessSound (void);
 
+#ifdef ARM_ALLOW_MULTI_CORE
+	enum TCoreStatus
+	{
+		CoreStatusInit,
+		CoreStatusIdle,
+		CoreStatusBusy,
+		CoreStatusExit,
+		CoreStatusUnknown
+	};
+#endif
+
 private:
 	CConfig *m_pConfig;
 
+	CDexedAdapter *m_pTG[CConfig::ToneGenerators];
+	unsigned m_nVoiceBankID[CConfig::ToneGenerators];
+
 	CUserInterface m_UI;
 	CSysExFileLoader m_SysExFileLoader;
 
@@ -76,6 +102,12 @@ class CMiniDexed : public CDexedAdapter
 	CSoundBaseDevice *m_pSoundDevice;
 	unsigned m_nQueueSizeFrames;
 
+#ifdef ARM_ALLOW_MULTI_CORE
+	volatile TCoreStatus m_CoreStatus[CORES];
+	volatile unsigned m_nFramesToProcess;
+	int16_t m_OutputLevel[CConfig::ToneGenerators][CConfig::MaxChunkSize];
+#endif
+
 	CPerformanceTimer m_GetChunkTimer;
 	bool m_bProfileEnabled;
 };
diff --git a/src/pckeyboard.cpp b/src/pckeyboard.cpp
index 153cc315..a3f68783 100644
--- a/src/pckeyboard.cpp
+++ b/src/pckeyboard.cpp
@@ -18,7 +18,6 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 #include "pckeyboard.h"
-#include "minidexed.h"
 #include <circle/devicenameservice.h>
 #include <circle/util.h>
 #include <assert.h>
@@ -61,8 +60,8 @@ static TKeyInfo KeyTable[] =
 
 CPCKeyboard *CPCKeyboard::s_pThis = 0;
 
-CPCKeyboard::CPCKeyboard (CMiniDexed *pSynthesizer)
-:	m_pSynthesizer (pSynthesizer),
+CPCKeyboard::CPCKeyboard (CMiniDexed *pSynthesizer, CConfig *pConfig)
+:	CMIDIDevice (pSynthesizer, pConfig),
 	m_pKeyboard (0)
 {
 	s_pThis = this;
@@ -72,8 +71,6 @@ CPCKeyboard::CPCKeyboard (CMiniDexed *pSynthesizer)
 
 CPCKeyboard::~CPCKeyboard (void)
 {
-	m_pSynthesizer = 0;
-
 	s_pThis = 0;
 }
 
@@ -100,7 +97,6 @@ void CPCKeyboard::Process (boolean bPlugAndPlayUpdated)
 void CPCKeyboard::KeyStatusHandlerRaw (unsigned char ucModifiers, const unsigned char RawKeys[6])
 {
 	assert (s_pThis != 0);
-	assert (s_pThis->m_pSynthesizer != 0);
 
 	// report released keys
 	for (unsigned i = 0; i < 6; i++)
@@ -112,7 +108,8 @@ void CPCKeyboard::KeyStatusHandlerRaw (unsigned char ucModifiers, const unsigned
 			u8 ucKeyNumber = GetKeyNumber (ucKeyCode);
 			if (ucKeyNumber != 0)
 			{
-				s_pThis->m_pSynthesizer->keyup (ucKeyNumber);
+				u8 NoteOff[] = {0x80, ucKeyNumber, 0};
+				s_pThis->MIDIMessageHandler (NoteOff, sizeof NoteOff);
 			}
 		}
 	}
@@ -127,7 +124,8 @@ void CPCKeyboard::KeyStatusHandlerRaw (unsigned char ucModifiers, const unsigned
 			u8 ucKeyNumber = GetKeyNumber (ucKeyCode);
 			if (ucKeyNumber != 0)
 			{
-				s_pThis->m_pSynthesizer->keydown (ucKeyNumber, 100);
+				u8 NoteOn[] = {0x90, ucKeyNumber, 100};
+				s_pThis->MIDIMessageHandler (NoteOn, sizeof NoteOn);
 			}
 		}
 	}
diff --git a/src/pckeyboard.h b/src/pckeyboard.h
index 26fc9913..6baf5206 100644
--- a/src/pckeyboard.h
+++ b/src/pckeyboard.h
@@ -20,16 +20,18 @@
 #ifndef _pckeyboard_h
 #define _pckeyboard_h
 
+#include "mididevice.h"
+#include "config.h"
 #include <circle/usb/usbkeyboard.h>
 #include <circle/device.h>
 #include <circle/types.h>
 
 class CMiniDexed;
 
-class CPCKeyboard
+class CPCKeyboard : public CMIDIDevice
 {
 public:
-	CPCKeyboard (CMiniDexed *pSynthesizer);
+	CPCKeyboard (CMiniDexed *pSynthesizer, CConfig *pConfig);
 	~CPCKeyboard (void);
 
 	void Process (boolean bPlugAndPlayUpdated);
@@ -44,8 +46,6 @@ class CPCKeyboard
 	static void DeviceRemovedHandler (CDevice *pDevice, void *pContext);
 
 private:
-	CMiniDexed *m_pSynthesizer;
-
 	CUSBKeyboardDevice * volatile m_pKeyboard;
 
 	u8 m_LastKeys[6];
diff --git a/src/sysexfileloader.cpp b/src/sysexfileloader.cpp
index a22a9a56..126703fa 100644
--- a/src/sysexfileloader.cpp
+++ b/src/sysexfileloader.cpp
@@ -45,8 +45,7 @@ uint8_t CSysExFileLoader::s_DefaultVoice[SizeSingleVoice] =	// FM-Piano
 };
 
 CSysExFileLoader::CSysExFileLoader (const char *pDirName)
-:	m_DirName (pDirName),
-	m_nBankID (0)
+:	m_DirName (pDirName)
 {
 	m_DirName += "/voice";
 
@@ -168,22 +167,14 @@ std::string CSysExFileLoader::GetBankName (unsigned nBankID)
 	return "NO NAME";
 }
 
-void CSysExFileLoader::SelectVoiceBank (unsigned nBankID)
+void CSysExFileLoader::GetVoice (unsigned nBankID, unsigned nVoiceID, uint8_t *pVoiceData)
 {
-	if (nBankID <= MaxVoiceBankID)
-	{
-		m_nBankID = nBankID;
-	}
-}
-
-void CSysExFileLoader::GetVoice (unsigned nVoiceID, uint8_t *pVoiceData)
-{
-	if (nVoiceID <= VoicesPerBank)
+	if (   nBankID <= MaxVoiceBankID
+	    && nVoiceID <= VoicesPerBank)
 	{
-		assert (m_nBankID <= MaxVoiceBankID);
-		if (m_pVoiceBank[m_nBankID])
+		if (m_pVoiceBank[nBankID])
 		{
-			DecodePackedVoice (m_pVoiceBank[m_nBankID]->Voice[nVoiceID], pVoiceData);
+			DecodePackedVoice (m_pVoiceBank[nBankID]->Voice[nVoiceID], pVoiceData);
 
 			return;
 		}
@@ -191,7 +182,7 @@ void CSysExFileLoader::GetVoice (unsigned nVoiceID, uint8_t *pVoiceData)
 		{
 			// Use default voices_bank instead of s_DefaultVoice for bank 0,
 			// if the bank was not successfully loaded from disk.
-			if (m_nBankID == 0)
+			if (nBankID == 0)
 			{
 				memcpy (pVoiceData, voices_bank[0][nVoiceID], SizeSingleVoice);
 
diff --git a/src/sysexfileloader.h b/src/sysexfileloader.h
index fb5d0e6f..bf7c9188 100644
--- a/src/sysexfileloader.h
+++ b/src/sysexfileloader.h
@@ -58,9 +58,8 @@ class CSysExFileLoader		// Loader for DX7 .syx files
 
 	std::string GetBankName (unsigned nBankID);	// 0 .. 127
 
-	void SelectVoiceBank (unsigned nBankID);	// 0 .. 127
-
-	void GetVoice (unsigned nVoiceID,		// 0 .. 31
+	void GetVoice (unsigned nBankID,		// 0 .. 127
+		       unsigned nVoiceID,		// 0 .. 31
 		       uint8_t *pVoiceData);		// returns unpacked format (156 bytes)
 
 private:
@@ -72,8 +71,6 @@ class CSysExFileLoader		// Loader for DX7 .syx files
 	TVoiceBank *m_pVoiceBank[MaxVoiceBankID+1];
 	std::string m_BankFileName[MaxVoiceBankID+1];
 
-	unsigned m_nBankID;
-
 	static uint8_t s_DefaultVoice[SizeSingleVoice];
 };
 
diff --git a/src/userinterface.cpp b/src/userinterface.cpp
index 6f573e2f..ee9bf4b4 100644
--- a/src/userinterface.cpp
+++ b/src/userinterface.cpp
@@ -37,10 +37,15 @@ CUserInterface::CUserInterface (CMiniDexed *pMiniDexed, CGPIOManager *pGPIOManag
 	m_pLCDBuffered (0),
 	m_pRotaryEncoder (0),
 	m_UIMode (UIModeVoiceSelect),
-	m_nBank (0),
-	m_nProgram (0),
-	m_nVolume (0)
+	m_nTG (0)
 {
+	for (unsigned nTG = 0; nTG < CConfig::ToneGenerators; nTG++)
+	{
+		m_nBank[nTG] = 0;
+		m_nProgram[nTG] = 0;
+		m_nVolume[nTG] = 0;
+		m_uchMIDIChannel[nTG] = CMIDIDevice::Disabled;
+	}
 }
 
 CUserInterface::~CUserInterface (void)
@@ -108,62 +113,100 @@ void CUserInterface::Process (void)
 	}
 }
 
-void CUserInterface::BankSelected (unsigned nBankLSB)
+void CUserInterface::BankSelected (unsigned nBankLSB, unsigned  nTG)
 {
 	assert (nBankLSB < 128);
-	m_nBank = nBankLSB;
+	assert (nTG < CConfig::ToneGenerators);
+	m_nBank[nTG] = nBankLSB;
 
 	assert (m_pMiniDexed);
 	std::string BankName = m_pMiniDexed->GetSysExFileLoader ()->GetBankName (nBankLSB);
 
 	// MIDI numbering starts with 0, user interface with 1
-	printf ("Select voice bank %u: \"%s\"\n", nBankLSB+1, BankName.c_str ());
+	printf ("TG%u: Select voice bank %u: \"%s\"\n", nTG+1, nBankLSB+1, BankName.c_str ());
 
-	if (m_UIMode == UIModeBankSelect)
+	if (   m_UIMode == UIModeBankSelect
+	    && m_nTG == nTG)
 	{
+		CString TG;
+		TG.Format ("TG%u", nTG+1);
+
 		CString String;
 		String.Format ("%u", nBankLSB+1);
 
-		DisplayWrite (String, "BANK", BankName.c_str ());
+		DisplayWrite (TG, "BANK", String, BankName.c_str ());
 	}
 }
 
-void CUserInterface::ProgramChanged (unsigned nProgram)
+void CUserInterface::ProgramChanged (unsigned nProgram, unsigned  nTG)
 {
 	assert (nProgram < 128);
-	m_nProgram = nProgram;
+	assert (nTG < CConfig::ToneGenerators);
+	m_nProgram[nTG] = nProgram;
 
 	nProgram++;	// MIDI numbering starts with 0, user interface with 1
 
-	// fetch program name from Dexed instance
-	char ProgramName[11];
-	memset (ProgramName, 0, sizeof ProgramName);
 	assert (m_pMiniDexed);
-	m_pMiniDexed->setName (ProgramName);
+	std::string VoiceName = m_pMiniDexed->GetVoiceName (nTG);
 
-	printf ("Loading voice %u: \"%s\"\n", nProgram, ProgramName);
+	printf ("TG%u: Loading voice %u: \"%s\"\n", nTG+1, nProgram, VoiceName.c_str ());
 
-	if (m_UIMode == UIModeVoiceSelect)
+	if (   m_UIMode == UIModeVoiceSelect
+	    && m_nTG == nTG)
 	{
+		CString TG;
+		TG.Format ("TG%u", nTG+1);
+
 		CString String;
 		String.Format ("%u", nProgram);
 
-		DisplayWrite (String, "VOICE", ProgramName);
+		DisplayWrite (TG, "VOICE", String, VoiceName.c_str ());
 	}
 }
 
-void CUserInterface::VolumeChanged (unsigned nVolume)
+void CUserInterface::VolumeChanged (unsigned nVolume, unsigned  nTG)
 {
 	assert (nVolume < 128);
-	m_nVolume = nVolume;
+	assert (nTG < CConfig::ToneGenerators);
+	m_nVolume[nTG] = nVolume;
 
-	if (m_UIMode == UIModeVolume)
+	if (   m_UIMode == UIModeVolume
+	    && m_nTG == nTG)
 	{
+		CString TG;
+		TG.Format ("TG%u", nTG+1);
+
 		char VolumeBar[CConfig::LCDColumns+1];
 		memset (VolumeBar, 0xFF, sizeof VolumeBar);	// 0xFF is the block character
 		VolumeBar[nVolume * CConfig::LCDColumns / 127] = '\0';
 
-		DisplayWrite ("", "VOLUME", VolumeBar);
+		DisplayWrite (TG, "VOLUME", VolumeBar);
+	}
+}
+
+void CUserInterface::MIDIChannelChanged (uint8_t uchChannel, unsigned  nTG)
+{
+	assert (nTG < CConfig::ToneGenerators);
+	m_uchMIDIChannel[nTG] = uchChannel;
+
+	if (   m_UIMode == UIModeMIDI
+	    && m_nTG == nTG)
+	{
+		CString TG;
+		TG.Format ("TG%u", nTG+1);
+
+		CString String;
+		switch (uchChannel)
+		{
+		case CMIDIDevice::OmniMode:	String = "OMNI";	break;
+		case CMIDIDevice::Disabled:	String = "OFF";		break;
+
+		default:
+			String.Format ("%u", (unsigned) uchChannel+1);
+			break;
+		}
+
+		DisplayWrite (TG, "MIDI", "CHANNEL", (const char *) String);
 	}
 }
 
@@ -174,6 +217,12 @@ void CUserInterface::DisplayWrite (const char *pInstance, const char *pMenu,
 	assert (pMenu);
 	assert (pParam);
 
+	// Do not show instance, if there is only one.
+	if (CConfig::ToneGenerators == 1)
+	{
+		pInstance = "";
+	}
+
 	CString Msg ("\x1B[H");		// cursor home
 
 	// first line
@@ -238,6 +287,13 @@ void CUserInterface::EncoderEventHandler (CKY040::TEvent Event)
 		}
 		break;
 
+	case CKY040::EventSwitchDoubleClick:
+		if (++m_nTG == CConfig::ToneGenerators)
+		{
+			m_nTG = 0;
+		}
+		break;
+
 	case CKY040::EventSwitchHold:
 		if (m_pRotaryEncoder->GetHoldSeconds () >= 3)
 		{
@@ -245,7 +301,12 @@ void CUserInterface::EncoderEventHandler (CKY040::TEvent Event)
 
 			reboot ();
 		}
-		return;
+		else
+		{
+			m_UIMode = UIModeStart;
+			m_nTG = 0;
+		}
+		break;
 
 	default:
 		return;
@@ -254,23 +315,23 @@ void CUserInterface::EncoderEventHandler (CKY040::TEvent Event)
 	switch (m_UIMode)
 	{
 	case UIModeBankSelect:
-		if (m_nBank + nStep < 128)
+		if (m_nBank[m_nTG] + nStep < 128)
 		{
-			m_pMiniDexed->BankSelectLSB (m_nBank + nStep);
+			m_pMiniDexed->BankSelectLSB (m_nBank[m_nTG] + nStep, m_nTG);
 		}
 		break;
 
 	case UIModeVoiceSelect:
-		if (m_nProgram + nStep < 32)
+		if (m_nProgram[m_nTG] + nStep < 32)
 		{
-			m_pMiniDexed->ProgramChange (m_nProgram + nStep);
+			m_pMiniDexed->ProgramChange (m_nProgram[m_nTG] + nStep, m_nTG);
 		}
 		break;
 
 	case UIModeVolume: {
 		const int Increment = 128 / CConfig::LCDColumns;
 
-		int nVolume = m_nVolume + nStep*Increment;
+		int nVolume = m_nVolume[m_nTG] + nStep*Increment;
 		if (nVolume < 0)
 		{
 			nVolume = 0;
@@ -280,9 +341,16 @@ void CUserInterface::EncoderEventHandler (CKY040::TEvent Event)
 			nVolume = 127;
 		}
 
-		m_pMiniDexed->SetVolume (nVolume);
+		m_pMiniDexed->SetVolume (nVolume, m_nTG);
 		} break;
 
+	case UIModeMIDI:
+		if ((uint8_t) (m_uchMIDIChannel[m_nTG] + nStep) < CMIDIDevice::ChannelUnknown)
+		{
+			m_pMiniDexed->SetMIDIChannel (m_uchMIDIChannel[m_nTG] + nStep, m_nTG);
+		}
+		break;
+
 	default:
 		break;
 	}
diff --git a/src/userinterface.h b/src/userinterface.h
index 6e34d991..05d7d61d 100644
--- a/src/userinterface.h
+++ b/src/userinterface.h
@@ -25,6 +25,7 @@
 #include <display/hd44780device.h>
 #include <circle/gpiomanager.h>
 #include <circle/writebuffer.h>
+#include <stdint.h>
 
 class CMiniDexed;
 
@@ -38,9 +39,10 @@ class CUserInterface
 
 	void Process (void);
 
-	void BankSelected (unsigned nBankLSB);		// 0 .. 127
-	void ProgramChanged (unsigned nProgram);	// 0 .. 127
-	void VolumeChanged (unsigned nVolume);		// 0 .. 127
+	void BankSelected (unsigned nBankLSB, unsigned  nTG);		// 0 .. 127
+	void ProgramChanged (unsigned nProgram, unsigned  nTG);		// 0 .. 127
+	void VolumeChanged (unsigned nVolume, unsigned  nTG);		// 0 .. 127
+	void MIDIChannelChanged (uint8_t uchChannel, unsigned  nTG);
 
 private:
 	// Print to display in this format:
@@ -63,6 +65,7 @@ class CUserInterface
 		UIModeVoiceSelect = UIModeStart,
 		UIModeBankSelect,
 		UIModeVolume,
+		UIModeMIDI,
 		UIModeUnknown
 	};
 
@@ -78,9 +81,11 @@ class CUserInterface
 
 	TUIMode m_UIMode;
 
-	unsigned m_nBank;
-	unsigned m_nProgram;
-	unsigned m_nVolume;
+	unsigned m_nTG;
+	unsigned m_nBank[CConfig::ToneGenerators];
+	unsigned m_nProgram[CConfig::ToneGenerators];
+	unsigned m_nVolume[CConfig::ToneGenerators];
+	uint8_t m_uchMIDIChannel[CConfig::ToneGenerators];
 };
 
 #endif