Hmmm - not easy. Added some test code.

dexed.mh

@@ -0,0 +1,12 @@
+add https://github.com/dcoredump/dexed 0
+add http://gareus.org/oss/lv2/stepseq#s4n4 1
+add http://ll-plugins.nongnu.org/lv2/lv2pftci/beep2 2
+connect ttymidi:MIDI_in effect_0:lv2_events_in
+connect effect_1:midiout effect_0:lv2_events_in
+connect effect_1:midiout effect_2:midi
+connect effect_0:lv2_audio_out_1 system:playback_1
+connect effect_0:lv2_audio_out_1 system:playback_2
+connect effect_2:right system:playback_1
+connect effect_2:left system:playback_2
+param_set 1 grid_1_1 1
+param_set 1 grid_2_3 1

src/dexed.cpp

@@ -10,21 +10,25 @@
 #include "msfa/freqlut.h"
 #include "msfa/controllers.h"
 
-DexedVoice::DexedVoice(double rate, uint8_t fb) : m_key(lvtk::INVALID_KEY), m_rate(rate)
+DexedVoice::DexedVoice(double rate) : m_key(lvtk::INVALID_KEY), m_rate(rate)
 {
   voice.dx7_note=new Dx7Note;
-  feedback_bitdepth=fb;
 }
 
 void DexedVoice::on(unsigned char key, unsigned char velocity)
 {
+  m_key = key;
   voice.dx7_note->init(data, key, velocity, feedback_bitdepth);
+  voice.keydown=true;
+  printf("Dexed: key-down: %d %d\n",key,velocity);
 }
 
 void DexedVoice::off(unsigned char velocity)
 {
   voice.dx7_note->keyup();
+  voice.keydown=false;
   m_key = lvtk::INVALID_KEY;
+  printf("Dexed: key-up: %d\n",velocity);
 }
 
 unsigned char DexedVoice::get_key(void) const
@@ -41,11 +45,10 @@ void DexedVoice::render(uint32_t from, uint32_t to)
   {
     int32_t s;
     //dx7_note->compute(&s, lfovalue, lfodelay, &controllers);
-    voice.dx7_note->compute(&s, 0, 0, NULL);
+    voice.dx7_note->compute(&s, lfo.getsample(), lfo.getdelay(), &controllers);
     float fs=float(s)/(INT32_MAX);
     p(p_lv2_audio_out_1)[i]+=fs;
-
-  }
+  } 
 }
 
 void DexedVoice::post_process(uint32_t from, uint32_t to)
@@ -68,8 +71,6 @@ Dexed::Dexed(double rate) : lvtk::Synth<DexedVoice, Dexed>(p_n_ports, p_lv2_even
   PitchEnv::init(rate);
   Env::init_sr(rate);
 
-  Controllers controllers;
-
   engineType=DEXED_ENGINE_MARKI;
   feedback_bitdepth=11;
 
@@ -79,19 +80,9 @@ Dexed::Dexed(double rate) : lvtk::Synth<DexedVoice, Dexed>(p_n_ports, p_lv2_even
     data[i] = init_voice[i];
   }
 
-  add_voices(new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth),new DexedVoice(rate, feedback_bitdepth));
+  add_voices(new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate),new DexedVoice(rate));
 
   add_audio_outputs(p_lv2_audio_out_1);
 }
 
-uint8_t Dexed::get_feedback_bitdepth(void)
-{
-  return(feedback_bitdepth);
-}
-
-uint32_t Dexed::get_engineType(void)
-{
-  return(engineType);
-}
-
 static int _ = Dexed::register_class(p_uri);

src/dexed.h

@@ -49,7 +49,7 @@ enum DexedEngineResolution {
 class DexedVoice : public lvtk::Voice
 {
   public:
-    DexedVoice(double rate, uint8_t fb);
+    DexedVoice(double rate);
     void on(unsigned char key, unsigned char velocity);
     void off(unsigned char velocity);
     unsigned char get_key(void) const;
@@ -59,7 +59,6 @@ class DexedVoice : public lvtk::Voice
   protected:
     unsigned char m_key;
     double m_rate;
-    uint8_t feedback_bitdepth;
     ProcessorVoice voice;
 };
 
@@ -70,17 +69,21 @@ class Dexed : public lvtk::Synth<DexedVoice, Dexed>
   public:
     Dexed(double rate);
     FmCore *core;
-    uint8_t get_feedback_bitdepth(void);
-    uint32_t get_engineType(void);
 
   protected:
     // dexed internal
-    FmCore engineMsfa;
+};
+
+// GLOBALS
+
     EngineMkI engineMkI;
-    EngineOpl engineOpl;
+    //FmCore engineMsfa;
+    //EngineOpl engineOpl;
     uint8_t feedback_bitdepth;
     uint32_t engineType;
-};
+    Lfo lfo;
+    Controllers controllers;
+
 
 const char init_voice[] =
       { 99, 99, 99, 99, 99, 99, 99, 00, 39, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 7,