diff --git a/MicroDexed.ino b/MicroDexed.ino
index 717f9ac..1438745 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -737,7 +737,7 @@ void loop()
 #endif
       }
 #ifdef TEENSY4
-      if (midi_decay_timer > 250)
+      if (midi_decay_timer > MIDI_DECAY_LEVEL_TIME)
       {
         midi_decay_timer = 0;
       }
@@ -1894,6 +1894,7 @@ void initial_values_from_eeprom(bool init)
 #endif
 
       load_sd_performance_json(eeprom_performance);
+      load_sd_sys_json();
     }
 #ifdef DEBUG
     Serial.println(F("OK, loaded!"));
@@ -1924,6 +1925,7 @@ void check_configuration_sys(void)
   configuration.sys.mono = constrain(configuration.sys.mono, MONO_MIN, MONO_MAX);
   configuration.sys.soft_midi_thru = constrain(configuration.sys.soft_midi_thru, SOFT_MIDI_THRU_MIN, SOFT_MIDI_THRU_MAX);
   configuration.sys.performance_number = constrain(configuration.sys.performance_number, PERFORMANCE_NUM_MIN, PERFORMANCE_NUM_MAX);
+  configuration.sys.favorites = constrain(configuration.sys.favorites, FAVORITES_NUM_MIN, FAVORITES_NUM_MAX);
 }
 
 void check_configuration_fx(void)
@@ -2625,10 +2627,10 @@ void check_and_create_directories(void)
       if (!SD.exists(tmp))
         SD.mkdir(tmp);  // Set Marker so that the Cleanup loops only run once.
     }
-/* #ifdef DEBUG
-    else
-      Serial.println(F("No SD card for directory check available."));
-#endif */
+    /* #ifdef DEBUG
+        else
+          Serial.println(F("No SD card for directory check available."));
+      #endif */
   }
 }
 
diff --git a/config.h b/config.h
index 2de574b..da1b2d0 100644
--- a/config.h
+++ b/config.h
@@ -321,6 +321,7 @@
 #define VELOCITY_CONFIG_NAME "velocity"
 #define FX_CONFIG_NAME "fx"
 #define VOICE_CONFIG_NAME "voice"
+#define SYS_CONFIG_NAME "sys"
 
 #define MAX_PERF_MOD 30
 
@@ -341,6 +342,7 @@
 // Teensy-4.x settings
 #ifdef TEENSY4
 #define MAX_NOTES 32
+#define MIDI_DECAY_LEVEL_TIME 500
 #endif
 
 // Teensy-3.6 settings
@@ -669,6 +671,10 @@
 #define EQ_7_MAX 18
 #define EQ_7_DEFAULT 15
 
+#define FAVORITES_NUM_MIN 0
+#define FAVORITES_NUM_MAX 100
+#define FAVORITES_NUM_DEFAULT 0
+
 // Buffer-size define for load/save configuration as JSON
 #define JSON_BUFFER_SIZE 8192
 
diff --git a/dexed_sd.cpp b/dexed_sd.cpp
index 78a7123..d6f091d 100644
--- a/dexed_sd.cpp
+++ b/dexed_sd.cpp
@@ -81,6 +81,7 @@ extern void handleStop(void);
 extern void handleStart(void);
 extern void dac_mute(void);
 extern void dac_unmute(void);
+extern void check_configuration_sys(void);
 extern uint8_t get_sample_note(uint8_t sample);
 extern float get_sample_pitch(uint8_t sample);
 extern float get_sample_p_offset(uint8_t sample);
@@ -944,6 +945,129 @@ bool save_sd_fx_json(uint8_t fx)
   return (false);
 }
 
+/******************************************************************************
+   SD SYS
+ ******************************************************************************/
+bool load_sd_sys_json(void)
+{
+  if (sd_card > 0)
+  {
+    File json;
+    StaticJsonDocument<JSON_BUFFER_SIZE> data_json;
+    char filename[CONFIG_FILENAME_LEN];
+    sprintf(filename, "/%s.json", SYS_CONFIG_NAME);
+
+    // first check if file exists...
+    AudioNoInterrupts();
+    if (SD.exists(filename))
+    {
+      // ... and if: load
+#ifdef DEBUG
+      Serial.print(F("Found sys configuration"));
+#endif
+      json = SD.open(filename);
+      if (json)
+      {
+        deserializeJson(data_json, json);
+
+        json.close();
+        AudioInterrupts();
+
+#ifdef DEBUG
+        Serial.println(F("Read JSON data:"));
+        serializeJsonPretty(data_json, Serial);
+        Serial.println();
+#endif
+
+        configuration.sys.instances = data_json["instances"];
+        configuration.sys.vol = data_json["vol"];
+        configuration.sys.mono = data_json["mono"];
+        configuration.sys.soft_midi_thru = data_json["soft_midi_thru"];
+        configuration.sys.performance_number = data_json["performance_number"];
+        configuration.sys.favorites = data_json["favorites"];
+
+        check_configuration_sys();
+        //set_sys_params(); //TODO
+
+        return (true);
+      }
+#ifdef DEBUG
+      else
+      {
+        Serial.print(F("E : Cannot open "));
+        Serial.print(filename);
+        Serial.println(F(" on SD."));
+      }
+    }
+    else
+    {
+      Serial.print(F("No "));
+      Serial.print(filename);
+      Serial.println(F(" available."));
+#endif
+    }
+  }
+
+  AudioInterrupts();
+  return (false);
+}
+
+bool save_sd_sys_json(void)
+{
+  char filename[CONFIG_FILENAME_LEN];
+
+  if (sd_card > 0)
+  {
+    File json;
+    StaticJsonDocument<JSON_BUFFER_SIZE> data_json;
+    sprintf(filename, "/%s.json", SYS_CONFIG_NAME);
+
+#ifdef DEBUG
+    Serial.print(F("Saving sys config to "));
+    Serial.println(filename);
+#endif
+
+    AudioNoInterrupts();
+    SD.begin();
+    SD.remove(filename);
+    json = SD.open(filename, FILE_WRITE);
+    if (json)
+    {
+      data_json["instances"] = configuration.sys.instances;
+      data_json["vol"] = configuration.sys.vol;
+      data_json["mono"] = configuration.sys.mono;
+      data_json["soft_midi_thru"] = configuration.sys.soft_midi_thru;
+      data_json["performance_number"] = configuration.sys.performance_number;
+      data_json["favorites"] = configuration.sys.favorites;
+
+#ifdef DEBUG
+      Serial.println(F("Write JSON data:"));
+      serializeJsonPretty(data_json, Serial);
+      Serial.println();
+#endif
+      serializeJsonPretty(data_json, json);
+      json.close();
+      AudioInterrupts();
+      return (true);
+    }
+    json.close();
+  }
+  else
+  {
+#ifdef DEBUG
+    Serial.print(F("E : Cannot open "));
+    Serial.print(filename);
+    Serial.println(F(" on SD."));
+#endif
+  }
+
+  AudioInterrupts();
+  return (false);
+}
+
+/******************************************************************************
+   SD SEQUENCER
+ ******************************************************************************/
 bool save_sd_seq_sub_vel_json(uint8_t seq_number)
 {
   char filename[CONFIG_FILENAME_LEN];
@@ -1383,6 +1507,7 @@ bool load_sd_performance_json(uint8_t seq_number)
       Serial.print(filename);
       Serial.println(F("]... loading..."));
 #endif
+      AudioNoInterrupts();
       json = SD.open(filename);
       if (json)
       {
@@ -1474,6 +1599,7 @@ bool load_sd_performance_json(uint8_t seq_number)
 #ifdef DEBUG
       else
       {
+        AudioInterrupts();
         Serial.print(F("E : Cannot open "));
         Serial.print(filename);
         Serial.println(F(" on SD."));
diff --git a/dexed_sd.h b/dexed_sd.h
index 3d93c27..08e2b51 100644
--- a/dexed_sd.h
+++ b/dexed_sd.h
@@ -57,6 +57,9 @@ bool save_sd_voiceconfig_json(uint8_t vc, uint8_t instance_id);
 bool load_sd_fx_json(uint8_t fx);
 bool save_sd_fx_json(uint8_t fx);
 
+bool load_sd_sys_json(void);
+bool save_sd_sys_json(void);
+
 bool load_sd_performance_json(uint8_t p);
 bool save_sd_performance_json(uint8_t p);