diff --git a/UI.hpp b/UI.hpp
index 8c5c3b3..c2fd8be 100644
--- a/UI.hpp
+++ b/UI.hpp
@@ -93,7 +93,6 @@ extern char sd_string[LCD_cols + 1];
 extern char g_voice_name[NUM_DEXED][VOICE_NAME_LEN];
 extern char g_bank_name[NUM_DEXED][BANK_NAME_LEN];
 
-extern void send_sysex_voice(uint8_t midi_channel, uint8_t* data);
 
 /***********************************************************************
    GLOBAL
@@ -1604,6 +1603,7 @@ void UI_func_transpose(uint8_t param)
 
     MicroDexed[selected_instance_id]->data[DEXED_VOICE_OFFSET + DEXED_TRANSPOSE] = configuration.dexed[selected_instance_id].transpose;
     MicroDexed[selected_instance_id]->notesOff();
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 144, configuration.dexed[selected_instance_id].transpose, 0);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -2331,6 +2331,7 @@ void UI_func_pb_range(uint8_t param)
     lcd_display_bar_int("PB Range", configuration.dexed[selected_instance_id].pb_range, 1.0, PB_RANGE_MIN, PB_RANGE_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setPBController(configuration.dexed[selected_instance_id].pb_range, configuration.dexed[selected_instance_id].pb_step);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 65, configuration.dexed[selected_instance_id].pb_range, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -2384,6 +2385,7 @@ void UI_func_pb_step(uint8_t param)
     lcd_display_bar_int("PB Step", configuration.dexed[selected_instance_id].pb_step, 1.0, PB_STEP_MIN, PB_STEP_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setPBController(configuration.dexed[selected_instance_id].pb_range, configuration.dexed[selected_instance_id].pb_step);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 66, configuration.dexed[selected_instance_id].pb_step, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -2437,6 +2439,7 @@ void UI_func_mw_range(uint8_t param)
     lcd_display_bar_int("MW Range", configuration.dexed[selected_instance_id].mw_range, 1.0, MW_RANGE_MIN, MW_RANGE_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setMWController(configuration.dexed[selected_instance_id].mw_range, configuration.dexed[selected_instance_id].mw_assign, configuration.dexed[selected_instance_id].mw_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 70, configuration.dexed[selected_instance_id].mw_range, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -2488,6 +2491,7 @@ void UI_func_mw_assign(uint8_t param)
     }
 
     MicroDexed[selected_instance_id]->setMWController(configuration.dexed[selected_instance_id].mw_range, configuration.dexed[selected_instance_id].mw_assign, configuration.dexed[selected_instance_id].mw_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 71, configuration.dexed[selected_instance_id].mw_assign, 2);
 
     lcd.setCursor(0, 1);
     switch (configuration.dexed[selected_instance_id].mw_assign)
@@ -2636,6 +2640,7 @@ void UI_func_fc_range(uint8_t param)
     lcd_display_bar_int("FC Range", configuration.dexed[selected_instance_id].fc_range, 1.0, FC_RANGE_MIN, FC_RANGE_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setFCController(configuration.dexed[selected_instance_id].fc_range, configuration.dexed[selected_instance_id].fc_assign, configuration.dexed[selected_instance_id].fc_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 72, configuration.dexed[selected_instance_id].fc_range, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -2687,6 +2692,7 @@ void UI_func_fc_assign(uint8_t param)
     }
 
     MicroDexed[selected_instance_id]->setFCController(configuration.dexed[selected_instance_id].fc_range, configuration.dexed[selected_instance_id].fc_assign, configuration.dexed[selected_instance_id].fc_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 73, configuration.dexed[selected_instance_id].fc_assign, 2);
 
     lcd.setCursor(0, 1);
     switch (configuration.dexed[selected_instance_id].fc_assign)
@@ -2835,6 +2841,7 @@ void UI_func_bc_range(uint8_t param)
     lcd_display_bar_int("BC Range", configuration.dexed[selected_instance_id].bc_range, 1.0, BC_RANGE_MIN, BC_RANGE_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setBCController(configuration.dexed[selected_instance_id].bc_range, configuration.dexed[selected_instance_id].bc_assign, configuration.dexed[selected_instance_id].bc_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 74, configuration.dexed[selected_instance_id].bc_range, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -2886,6 +2893,7 @@ void UI_func_bc_assign(uint8_t param)
     }
 
     MicroDexed[selected_instance_id]->setBCController(configuration.dexed[selected_instance_id].bc_range, configuration.dexed[selected_instance_id].bc_assign, configuration.dexed[selected_instance_id].bc_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 75, configuration.dexed[selected_instance_id].bc_assign, 2);
 
     lcd.setCursor(0, 1);
     switch (configuration.dexed[selected_instance_id].bc_assign)
@@ -3034,6 +3042,7 @@ void UI_func_at_range(uint8_t param)
     lcd_display_bar_int("AT Range", configuration.dexed[selected_instance_id].at_range, 1.0, AT_RANGE_MIN, AT_RANGE_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setATController(configuration.dexed[selected_instance_id].at_range, configuration.dexed[selected_instance_id].at_assign, configuration.dexed[selected_instance_id].at_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 76, configuration.dexed[selected_instance_id].at_range, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -3086,6 +3095,7 @@ void UI_func_at_assign(uint8_t param)
     }
 
     MicroDexed[selected_instance_id]->setATController(configuration.dexed[selected_instance_id].at_range, configuration.dexed[selected_instance_id].at_assign, configuration.dexed[selected_instance_id].at_mode);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 77, configuration.dexed[selected_instance_id].at_assign, 2);
 
     lcd.setCursor(0, 1);
     switch (configuration.dexed[selected_instance_id].at_assign)
@@ -3232,6 +3242,7 @@ void UI_func_portamento_mode(uint8_t param)
     }
 
     MicroDexed[selected_instance_id]->setPortamentoMode(configuration.dexed[selected_instance_id].portamento_mode, configuration.dexed[selected_instance_id].portamento_glissando, configuration.dexed[selected_instance_id].portamento_time);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 67, configuration.dexed[selected_instance_id].portamento_mode, 2);
 
     lcd.setCursor(0, 1);
     switch (configuration.dexed[selected_instance_id].portamento_mode)
@@ -3300,6 +3311,7 @@ void UI_func_portamento_glissando(uint8_t param)
     }
 
     MicroDexed[selected_instance_id]->setPortamentoMode(configuration.dexed[selected_instance_id].portamento_mode, configuration.dexed[selected_instance_id].portamento_glissando, configuration.dexed[selected_instance_id].portamento_time);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 68, configuration.dexed[selected_instance_id].portamento_glissando, 2);
 
     lcd.setCursor(0, 1);
     switch (configuration.dexed[selected_instance_id].portamento_glissando)
@@ -3364,6 +3376,7 @@ void UI_func_portamento_time(uint8_t param)
     lcd_display_bar_int("Portam. Time", configuration.dexed[selected_instance_id].portamento_time, 1.0, PORTAMENTO_TIME_MIN, PORTAMENTO_TIME_MAX, 2, false, false, false);
 
     MicroDexed[selected_instance_id]->setPortamentoMode(configuration.dexed[selected_instance_id].portamento_mode, configuration.dexed[selected_instance_id].portamento_glissando, configuration.dexed[selected_instance_id].portamento_time);
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 69, configuration.dexed[selected_instance_id].portamento_time, 2);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
@@ -3444,6 +3457,7 @@ void UI_handle_OP(uint8_t param)
 
     MicroDexed[selected_instance_id]->setOPs(configuration.dexed[selected_instance_id].op_enabled);
     MicroDexed[selected_instance_id]->doRefreshVoice();
+    send_sysex_param(configuration.dexed[selected_instance_id].midi_channel, 155, configuration.dexed[selected_instance_id].op_enabled, 0);
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
diff --git a/dexed.cpp b/dexed.cpp
index 33236a0..b7cfd14 100644
--- a/dexed.cpp
+++ b/dexed.cpp
@@ -510,7 +510,7 @@ uint8_t Dexed::getNumNotesPlaying(void)
   return (count_playing_voices);
 }
 
-bool Dexed::decodeVoice(uint8_t* encoded_data,uint8_t* new_data)
+bool Dexed::decodeVoice(uint8_t* encoded_data, uint8_t* new_data)
 {
   uint8_t* p_data = new_data;
   uint8_t op;
diff --git a/doc/param_assignment.txt b/doc/param_assignment.txt
new file mode 100644
index 0000000..de25dc9
--- /dev/null
+++ b/doc/param_assignment.txt
@@ -0,0 +1,15 @@
+transpose		FUNC 144
+operator		FUNC 155
+pb_range		SYSEX 65
+pb_step			SYSEX 66
+mw_range		SYSEX 70
+mw_assign		SYSEX 71
+fc_range		SYSEX 72
+fc_assign		SYSEX 73
+bc_range		SYSEX 74
+bc_assign		SYSEX 75
+at_range		SYSEX 76
+at_assign		SYSEX 77
+portamento_mode		SYSEX 67
+portamento_glissando	SYSEX 68
+portamento_time		SYSEX 69
diff --git a/midi_devices.hpp b/midi_devices.hpp
index ba9c67a..c9183fa 100644
--- a/midi_devices.hpp
+++ b/midi_devices.hpp
@@ -1703,4 +1703,27 @@ void send_sysex_bank(uint8_t midi_channel, uint8_t* bank_data)
   usbMIDI.sendSysEx(4104, bank_data); // Send to USB-HOST MIDI
 }
 
+void send_sysex_param(uint8_t midi_channel, uint8_t var, uint8_t val, uint8_t param_group)
+{
+  uint8_t s[5];
+
+  s[0] = 0x43; // ID=Yamaha
+  s[1] = midi_channel; // Sub-status and MIDI channel
+  s[2] = (param_group & 5) << 2; // Format number (0=1 voice)
+  if (param_group == 0)
+  {
+    s[2] |= 1;
+    s[3] = var & 0x7f;
+  }
+  else
+  {
+    s[3] = var & 0x7f;
+  }
+  s[4] = val & 0x7f;
+
+  midi_serial.sendSysEx(5, s); // Send to DIN MIDI
+  midi_usb.sendSysEx(5, s); // Send to USB MIDI
+  usbMIDI.sendSysEx(5, s); // Send to USB-HOST MIDI
+}
+
 #endif // MIDI_DEVICES_H