diff --git a/MicroDexed.ino b/MicroDexed.ino
index 38069a8..120913b 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -43,7 +43,7 @@
 #include "UI.hpp"
 
 // Audio engines
-AudioSourceMicroDexed*     MicroDexed[NUM_DEXED];
+AudioSynthDexed*     MicroDexed[NUM_DEXED];
 #if defined(USE_FX)
 AudioSynthWaveform*        chorus_modulator[NUM_DEXED];
 #if MOD_FILTER_OUTPUT != MOD_NO_FILTER_OUTPUT
@@ -173,7 +173,7 @@ AudioConnection * dynamicConnections[NUM_DEXED * 4];
 #endif
 void create_audio_engine_chain(uint8_t instance_id)
 {
-  MicroDexed[instance_id] = new AudioSourceMicroDexed(SAMPLE_RATE);
+  MicroDexed[instance_id] = new AudioSynthDexed(SAMPLE_RATE);
   mono2stereo[instance_id] = new AudioEffectMonoStereo();
 #if defined(USE_FX)
   chorus_modulator[instance_id] = new AudioSynthWaveform();
diff --git a/UI.hpp b/UI.hpp
index 582c367..9b4d0a9 100644
--- a/UI.hpp
+++ b/UI.hpp
@@ -70,7 +70,7 @@ extern void change_disp_sd(bool d);
 #endif
 
 extern AudioControlSGTL5000       sgtl5000_1;
-extern AudioSourceMicroDexed*     MicroDexed[NUM_DEXED];
+extern AudioSynthDexed*     MicroDexed[NUM_DEXED];
 #if defined(USE_FX)
 extern AudioSynthWaveform*        chorus_modulator[NUM_DEXED];
 extern AudioEffectModulatedDelay* modchorus[NUM_DEXED];
diff --git a/dexed_sd.h b/dexed_sd.h
index f2ead00..4a00eb9 100644
--- a/dexed_sd.h
+++ b/dexed_sd.h
@@ -30,7 +30,7 @@
 
 extern uint8_t sd_card;
 extern Dexed* dexed;
-extern AudioSourceMicroDexed * MicroDexed[NUM_DEXED];
+extern AudioSynthDexed * MicroDexed[NUM_DEXED];
 extern void show_patch(uint8_t instance_id);
 
 extern void send_sysex_voice(uint8_t midi_channel, uint8_t* data);
diff --git a/synth_dexed.cpp b/synth_dexed.cpp
index ab80013..519fe7c 100644
--- a/synth_dexed.cpp
+++ b/synth_dexed.cpp
@@ -1,4 +1,5 @@
 #include "synth_dexed.h"
+
 /**
 
    Copyright (c) 2013-2014 Pascal Gauthier.
@@ -388,13 +389,76 @@ void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
     else if (vuSignal > 0.001f)
       vuSignal *= decayFactor;
     else
-      vuSignal = 0;
+      vuSignal = 0.0;
   }
 
   //arm_scale_f32(sumbuf, 0.00015, sumbuf, AUDIO_BLOCK_SAMPLES);
   arm_float_to_q15(sumbuf, buffer, AUDIO_BLOCK_SAMPLES);
 }
 
+void Dexed::getSamples(uint16_t n_samples, float32_t* buffer)
+{
+  uint16_t i, j;
+  uint8_t note;
+  float s;
+  const double decayFactor = 0.99992;
+
+  if (refreshVoice)
+  {
+    for (i = 0; i < max_notes; i++)
+    {
+      if ( voices[i].live )
+        voices[i].dx7_note->update(data, voices[i].midi_note, voices[i].velocity, voices[i].porta, &controllers);
+    }
+    lfo.reset(data + 137);
+    refreshVoice = false;
+  }
+
+  for (i = 0; i < n_samples; i += _N_)
+  {
+    AlignedBuf<int32_t, _N_> audiobuf;
+
+    for (uint8_t j = 0; j < _N_; ++j)
+    {
+      audiobuf.get()[j] = 0;
+      buffer[i + j] = 0.0;
+    }
+
+    int32_t lfovalue = lfo.getsample();
+    int32_t lfodelay = lfo.getdelay();
+
+    for (note = 0; note < max_notes; note++)
+    {
+      if (voices[note].live)
+      {
+        voices[note].dx7_note->compute(audiobuf.get(), lfovalue, lfodelay, &controllers);
+
+        for (j = 0; j < _N_; ++j)
+        {
+          buffer[i + j] += static_cast<float>(audiobuf.get()[j]) / 32768;
+          audiobuf.get()[j] = 0;
+        }
+      }
+    }
+  }
+
+  fx.process(buffer, n_samples); // Needed for fx.Gain()!!!
+
+  // mild compression
+  for (i = 0; i < n_samples; i++)
+  {
+    s = abs(buffer[i]);
+    if (s > vuSignal)
+      vuSignal = s;
+    else if (vuSignal > 0.001f)
+      vuSignal *= decayFactor;
+    else
+      vuSignal = 0;
+  }
+
+  arm_scale_f32(buffer, 0.00015, buffer, AUDIO_BLOCK_SAMPLES);
+}
+
 void Dexed::keydown(int16_t pitch, uint8_t velo) {
   if ( velo == 0 ) {
     keyup(pitch);
@@ -1591,20 +1655,20 @@ void Env::transfer(Env &src) {
   inc_ = src.inc_;
 }
 /*
- * Copyright 2013 Google Inc.
- * 
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *      http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+   Copyright 2013 Google Inc.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
 
 #ifdef _MSC_VER
 #define exp2(arg) pow(2.0, arg)
@@ -2323,20 +2387,20 @@ void Porta::init_sr(double sampleRate)
 
 int32_t Porta::rates[128];
 /*
- * Copyright 2012 Google Inc.
- * 
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *      http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+   Copyright 2012 Google Inc.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
 
 #define R (1 << 29)
 
@@ -2386,7 +2450,7 @@ int32_t Sin::lookup(int32_t phase) {
   int y0 = sintab[phase_int + 1];
 
   return y0 + (((int64_t)dy * (int64_t)lowbits) >> SHIFT);
-#else 
+#else
   int phase_int = (phase >> SHIFT) & (SIN_N_SAMPLES - 1);
   int y0 = sintab[phase_int];
   int y1 = sintab[phase_int + 1];
@@ -2413,9 +2477,9 @@ int32_t Sin::compute(int32_t phase) {
   int32_t x4 = ((int64_t)x2 * (int64_t)x2) >> 24;
   int32_t x6 = ((int64_t)x2 * (int64_t)x4) >> 24;
   int32_t y = C0 -
-    (((int64_t)C1 * (int64_t)x2) >> 24) +
-    (((int64_t)C2 * (int64_t)x4) >> 24) -
-    (((int64_t)C3 * (int64_t)x6) >> 24);
+              (((int64_t)C1 * (int64_t)x2) >> 24) +
+              (((int64_t)C2 * (int64_t)x4) >> 24) -
+              (((int64_t)C3 * (int64_t)x6) >> 24);
   y ^= -((phase >> 23) & 1);
   return y;
 }
@@ -2433,10 +2497,10 @@ int32_t Sin::compute(int32_t phase) {
   int32_t x = (phase & ((1 << 23) - 1)) - (1 << 22);
   int32_t x2 = ((int64_t)x * (int64_t)x) >> 16;
   int32_t y = (((((((((((((int64_t)C8_8
-    * (int64_t)x2) >> 32) + C8_6)
-    * (int64_t)x2) >> 32) + C8_4)
-    * (int64_t)x2) >> 32) + C8_2)
-    * (int64_t)x2) >> 32) + C8_0);
+                          * (int64_t)x2) >> 32) + C8_6)
+                       * (int64_t)x2) >> 32) + C8_4)
+                    * (int64_t)x2) >> 32) + C8_2)
+                 * (int64_t)x2) >> 32) + C8_0);
   y ^= -((phase >> 23) & 1);
   return y;
 }
@@ -2452,11 +2516,11 @@ int32_t Sin::compute10(int32_t phase) {
   int32_t x = (phase & ((1 << 29) - 1)) - (1 << 28);
   int32_t x2 = ((int64_t)x * (int64_t)x) >> 26;
   int32_t y = ((((((((((((((((int64_t)C10_10
-    * (int64_t)x2) >> 34) + C10_8)
-    * (int64_t)x2) >> 34) + C10_6)
-    * (int64_t)x2) >> 34) + C10_4)
-    * (int64_t)x2) >> 32) + C10_2)
-    * (int64_t)x2) >> 30) + C10_0);
+                             * (int64_t)x2) >> 34) + C10_8)
+                          * (int64_t)x2) >> 34) + C10_6)
+                       * (int64_t)x2) >> 34) + C10_4)
+                    * (int64_t)x2) >> 32) + C10_2)
+                 * (int64_t)x2) >> 30) + C10_0);
   y ^= -((phase >> 29) & 1);
   return y;
 }
diff --git a/synth_dexed.h b/synth_dexed.h
index 57dd096..94a2e7c 100644
--- a/synth_dexed.h
+++ b/synth_dexed.h
@@ -1,8 +1,12 @@
 #include <Arduino.h>
 #include <Audio.h>
 #include "config.h"
+#if defined(USE_OPEN_AUDIO_LIB)
+#include "OpenAudio_ArduinoLibrary.h"
+#endif
+
 /*****************************************************
- * CODE; orig_code/synth.h
+   CODE; orig_code/synth.h
  *****************************************************/
 /*
    Copyright 2012 Google Inc.
@@ -76,7 +80,7 @@ inline static T max(const T& a, const T& b) {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/aligned_buf.h
+   CODE; orig_code/aligned_buf.h
  *****************************************************/
 /*
    Copyright 2013 Google Inc.
@@ -111,7 +115,7 @@ class AlignedBuf {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/sin.h
+   CODE; orig_code/sin.h
  *****************************************************/
 /*
    Copyright 2012 Google Inc.
@@ -178,7 +182,7 @@ int32_t Sin::lookup(int32_t phase) {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/exp2.h
+   CODE; orig_code/exp2.h
  *****************************************************/
 /*
    Copyright 2012 Google Inc.
@@ -263,16 +267,16 @@ int32_t Tanh::lookup(int32_t x) {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/fast_log.h
+   CODE; orig_code/fast_log.h
  *****************************************************/
 /* ----------------------------------------------------------------------
-* https://community.arm.com/tools/f/discussions/4292/cmsis-dsp-new-functionality-proposal/22621#22621
-* Fast approximation to the log2() function.  It uses a two step
-* process.  First, it decomposes the floating-point number into
-* a fractional component F and an exponent E.  The fraction component
-* is used in a polynomial approximation and then the exponent added
-* to the result.  A 3rd order polynomial is used and the result
-* when computing db20() is accurate to 7.984884e-003 dB.
+  https://community.arm.com/tools/f/discussions/4292/cmsis-dsp-new-functionality-proposal/22621#22621
+  Fast approximation to the log2() function.  It uses a two step
+  process.  First, it decomposes the floating-point number into
+  a fractional component F and an exponent E.  The fraction component
+  is used in a polynomial approximation and then the exponent added
+  to the result.  A 3rd order polynomial is used and the result
+  when computing db20() is accurate to 7.984884e-003 dB.
 ** ------------------------------------------------------------------- */
 
 static float log2f_approx_coeff[4] = {1.23149591368684f, -4.11852516267426f, 6.02197014179219f, -3.13396450166353f};
@@ -296,7 +300,7 @@ static float log2f_approx(float X)
   Y *= F;
   Y += (*C++);
   Y += E;
-  return(Y);
+  return (Y);
 }
 
 // https://codingforspeed.com/using-faster-exponential-approximation/
@@ -309,16 +313,16 @@ inline float expf_approx(float x) {
 }
 
 inline float unitToDb(float unit) {
-	return 6.02f * log2f_approx(unit);
+  return 6.02f * log2f_approx(unit);
 }
 
 inline float dbToUnit(float db) {
-	return expf_approx(db * 2.302585092994046f * 0.05f);
+  return expf_approx(db * 2.302585092994046f * 0.05f);
 }
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/freqlut.h
+   CODE; orig_code/freqlut.h
  *****************************************************/
 /*
    Copyright 2012 Google Inc.
@@ -344,7 +348,7 @@ class Freqlut {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/lfo.h
+   CODE; orig_code/lfo.h
  *****************************************************/
 /*
    Copyright 2013 Google Inc.
@@ -392,7 +396,7 @@ class Lfo {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/env.h
+   CODE; orig_code/env.h
  *****************************************************/
 /*
    Copyright 2017 Pascal Gauthier.
@@ -472,7 +476,7 @@ class Env {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/pitchenv.h
+   CODE; orig_code/pitchenv.h
  *****************************************************/
 /*
    Copyright 2013 Google Inc.
@@ -525,7 +529,7 @@ extern const int8_t pitchenv_tab[];
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/controllers.h
+   CODE; orig_code/controllers.h
  *****************************************************/
 /*
    Copyright 2013 Google Inc.
@@ -571,12 +575,12 @@ class FmMod {
 
     void setRange(uint8_t r)
     {
-      range = r < 0 || r > 99 ? 0 : r;
+      range = r < 0 && r > 99 ? 0 : r;
     }
 
     void setTarget(uint8_t assign)
     {
-      assign = assign < 0 || assign > 7 ? 0 : assign;
+      assign = assign < 0 && assign > 7 ? 0 : assign;
       pitch = assign & 1; // PITCH
       amp = assign & 2; // AMP
       eg = assign & 4; // EG
@@ -664,7 +668,7 @@ class Controllers {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/PluginFx.h
+   CODE; orig_code/PluginFx.h
  *****************************************************/
 /**
 
@@ -738,7 +742,7 @@ class PluginFx {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/fm_op_kernel.h
+   CODE; orig_code/fm_op_kernel.h
  *****************************************************/
 /*
    Copyright 2012 Google Inc.
@@ -786,7 +790,7 @@ class FmOpKernel {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/fm_core.h
+   CODE; orig_code/fm_core.h
  *****************************************************/
 /*
    Copyright 2012 Google Inc.
@@ -839,7 +843,7 @@ class FmCore {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/dx7note.h
+   CODE; orig_code/dx7note.h
  *****************************************************/
 /*
    Copyright 2016-2017 Pascal Gauthier.
@@ -918,7 +922,7 @@ class Dx7Note {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/dexed.h
+   CODE; orig_code/dexed.h
  *****************************************************/
 /*
    MicroDexed
@@ -1043,7 +1047,7 @@ class Dexed
     bool isMonoMode(void);
     void setMonoMode(bool mode);
     void setRefreshMode(bool mode);
-    void getSamples(uint16_t n_samples, int16_t* buffer);
+    //void getSamples(uint16_t n_samples, int16_t* buffer);
     void panic(void);
     void notesOff(void);
     void resetControllers(void);
@@ -1102,12 +1106,14 @@ class Dexed
     VoiceStatus voiceStatus;
     Lfo lfo;
     FmCore* engineMsfa;
+    void getSamples(uint16_t n_samples, float32_t* buffer);
+    void getSamples(uint16_t n_samples, int16_t* buffer);
 };
 
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/porta.h
+   CODE; orig_code/porta.h
  *****************************************************/
 /*
    Copyright 2019 Jean Pierre Cimalando.
@@ -1134,16 +1140,16 @@ struct Porta {
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/source_microdexed.h
+   CODE; orig_code/source_microdexed.h
  *****************************************************/
 
-class AudioSourceMicroDexed : public AudioStream, public Dexed {
+class AudioSynthDexed : public AudioStream, public Dexed {
   public:
     const uint16_t audio_block_time_us = 1000000 / (SAMPLE_RATE / AUDIO_BLOCK_SAMPLES);
     uint32_t xrun = 0;
     uint16_t render_time_max = 0;
 
-    AudioSourceMicroDexed(int sample_rate) : AudioStream(0, NULL), Dexed(sample_rate) { };
+    AudioSynthDexed(int sample_rate) : AudioStream(0, NULL), Dexed(sample_rate) { };
 
     void update(void)
     {
@@ -1184,64 +1190,113 @@ class AudioSourceMicroDexed : public AudioStream, public Dexed {
     volatile bool in_update = false;
 };
 
+#if defined(USE_OPEN_AUDIO_LIB)
+class AudioSynthDexed_F32 : public AudioStream_F32, public Dexed {
+  public:
+    const uint16_t audio_block_time_us = 1000000 / (SAMPLE_RATE / AUDIO_BLOCK_SAMPLES);
+    uint32_t xrun = 0;
+    uint16_t render_time_max = 0;
+
+    AudioSynthDexed_F32(int sample_rate) : AudioStream_F32(0, NULL), Dexed(sample_rate) { };
+
+    void update(void)
+    {
+      if (in_update == true)
+      {
+        xrun++;
+        return;
+      }
+      else
+        in_update = true;
+
+      elapsedMicros render_time;
+      audio_block_f32_t *lblock;
+
+      lblock = allocate_f32();
+
+      if (!lblock)
+      {
+        in_update = false;
+        return;
+      }
+
+      getSamples(AUDIO_BLOCK_SAMPLES, lblock->data);
+
+      if (render_time > audio_block_time_us) // everything greater audio_block_time_us (2.9ms for buffer size of 128) is a buffer underrun!
+        xrun++;
+
+      if (render_time > render_time_max)
+        render_time_max = render_time;
+
+      AudioStream_F32::transmit(lblock, 0);
+      AudioStream_F32::release(lblock);
+
+      in_update = false;
+    };
+
+  private:
+    volatile bool in_update = false;
+};
+#endif
+
 //=====================================================
 /*****************************************************
- * CODE; orig_code/PluginFx.cpp
+   CODE; orig_code/PluginFx.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/dexed.cpp
+   CODE; orig_code/dexed.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/dx7note.cpp
+   CODE; orig_code/dx7note.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/env.cpp
+   CODE; orig_code/env.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/exp2.cpp
+   CODE; orig_code/exp2.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/fm_core.cpp
+   CODE; orig_code/fm_core.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/fm_op_kernel.cpp
+   CODE; orig_code/fm_op_kernel.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/freqlut.cpp
+   CODE; orig_code/freqlut.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/lfo.cpp
+   CODE; orig_code/lfo.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/pitchenv.cpp
+   CODE; orig_code/pitchenv.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/porta.cpp
+   CODE; orig_code/porta.cpp
  *****************************************************/
 
 //=====================================================
 /*****************************************************
- * CODE; orig_code/sin.cpp
+   CODE; orig_code/sin.cpp
  *****************************************************/
 
 //=====================================================