diff --git a/MicroDexed.ino b/MicroDexed.ino
index e5ae1a2..2cc28b4 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -916,7 +916,7 @@ bool checkMidiChannel(byte inChannel, uint8_t instance_id)
 void init_MIDI_send_CC(void)
 {
 #ifdef DEBUG
-  Serial.println("init_MIDI_send_CC():");
+  Serial.println(F("init_MIDI_send_CC():"));
 #endif
   MD_sendControlChange(configuration.dexed[selected_instance_id].midi_channel, 7, configuration.dexed[selected_instance_id].sound_intensity);
   MD_sendControlChange(configuration.dexed[selected_instance_id].midi_channel, 10, configuration.dexed[selected_instance_id].pan);
@@ -2991,7 +2991,7 @@ void show_patch(uint8_t instance_id)
     Serial.println(F("+======+======+======+======+======+======+======+======+================+================+================+"));
     Serial.println(F("|  R1  |  R2  |  R3  |  R4  |  L1  |  L2  |  L3  |  L4  | LEV_SCL_BRK_PT | SCL_LEFT_DEPTH | SCL_RGHT_DEPTH |"));
     Serial.println(F("+------+------+------+------+------+------+------+------+----------------+----------------+----------------+"));
-    Serial.print("| ");
+    Serial.print(F("| "));
     SerialPrintFormatInt3(MicroDexed[instance_id]->getVoiceDataElement((i * 21) + DEXED_OP_EG_R1));
     Serial.print(F("  | "));
     SerialPrintFormatInt3(MicroDexed[instance_id]->getVoiceDataElement((i * 21) + DEXED_OP_EG_R2));
diff --git a/UI.hpp b/UI.hpp
index b352aa5..f739fae 100644
--- a/UI.hpp
+++ b/UI.hpp
@@ -690,7 +690,7 @@ void lcdml_menu_control(void)
       else if ((millis() - g_LCDML_CONTROL_button_press_time[ENC_R]) >= LONG_BUTTON_PRESS)
       {
 #ifdef DEBUG
-        Serial.println("ENC-R long released");
+        Serial.println(F("ENC-R long released"));
 #endif
         //LCDML.BT_quit();
         encoderDir[ENC_R].ButtonLong(true);
@@ -710,7 +710,7 @@ void lcdml_menu_control(void)
   if (encoderDir[ENC_R].ButtonPressed() == true && (millis() - g_LCDML_CONTROL_button_press_time[ENC_R]) >= LONG_BUTTON_PRESS)
   {
 #ifdef DEBUG
-    Serial.println("ENC-R long recognized");
+    Serial.println(F("ENC-R long recognized"));
 #endif
     encoderDir[ENC_R].ButtonLong(true);
 
@@ -6688,9 +6688,9 @@ uint8_t search_accepted_char(uint8_t c)
   for (uint8_t i = 0; i < sizeof(accepted_chars) - 1; i++)
   {
     Serial.print(i, DEC);
-    Serial.print(":");
+    Serial.print(F(":"));
     Serial.print(c);
-    Serial.print("==");
+    Serial.print(F("=="));
     Serial.println(accepted_chars[i], DEC);
     if (c == accepted_chars[i])
       return (i);
@@ -7287,14 +7287,14 @@ bool check_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
   {
     snprintf_P(tmp, sizeof(tmp), PSTR("/%s/%d/%d.fav"), FAV_CONFIG_PATH, b, v);
 #ifdef DEBUG
-    Serial.print("check if Voice is a Favorite: ");
+    Serial.print(F("check if Voice is a Favorite: "));
     Serial.print(tmp);
     Serial.println();
 #endif
     if (SD.exists(tmp))
     { //is Favorite
 #ifdef DEBUG
-      Serial.println(" - It is in Favorites.");
+      Serial.println(F(" - It is in Favorites."));
 #endif
       return true;
     }
@@ -7302,7 +7302,7 @@ bool check_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
     { // it was not a favorite
 
 #ifdef DEBUG
-      Serial.println(" - It is not in Favorites.");
+      Serial.println(F(" - It is not in Favorites."));
 #endif
       return false;
     }
@@ -7350,14 +7350,14 @@ bool quick_check_favorites_in_bank(uint8_t b, uint8_t instance_id)
   {
     snprintf_P(tmp, sizeof(tmp), PSTR("/%s/%d"), FAV_CONFIG_PATH, b);
 #ifdef DEBUG
-    Serial.print("check if there is a Favorite in Bank: ");
+    Serial.print(F("check if there is a Favorite in Bank: "));
     Serial.print(tmp);
     Serial.println();
 #endif
     if (SD.exists(tmp) )
     { // this bank HAS at least 1 favorite(s)
 #ifdef DEBUG
-      Serial.println("quickcheck found a FAV in bank!");
+      Serial.println(F("quickcheck found a FAV in bank!"));
 #endif
       return (true);
     }
@@ -7365,7 +7365,7 @@ bool quick_check_favorites_in_bank(uint8_t b, uint8_t instance_id)
     { // no favorites in bank stored
       return (false);
 #ifdef DEBUG
-      Serial.println(" - It is no Favorite in current Bank.");
+      Serial.println(F(" - It is no Favorite in current Bank."));
 #endif
     }
   }
@@ -7376,7 +7376,7 @@ bool quick_check_favorites_in_bank(uint8_t b, uint8_t instance_id)
 void save_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
 {
 #ifdef DEBUG
-  Serial.println("Starting saving Favorite.");
+  Serial.println(F("Starting saving Favorite."));
 #endif
   b = constrain(b, 0, MAX_BANKS - 1);
   v = constrain(v, 0, MAX_VOICES - 1);
@@ -7389,7 +7389,7 @@ void save_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
     snprintf_P(tmp, sizeof(tmp), PSTR("/%s/%d/%d.fav"), FAV_CONFIG_PATH, b, v);
     snprintf_P(tmpfolder, sizeof(tmpfolder), PSTR("/%s/%d"), FAV_CONFIG_PATH, b);
 #ifdef DEBUG
-    Serial.println("Save Favorite to SD card...");
+    Serial.println(F("Save Favorite to SD card..."));
     Serial.println(tmp);
 #endif
     if (!SD.exists(tmp))
@@ -7400,7 +7400,7 @@ void save_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
       }
       myFav = SD.open(tmp, FILE_WRITE);
       myFav.close();
-      Serial.println("Favorite saved...");
+      Serial.println(F("Favorite saved..."));
 #ifdef TESTDISPLAY20x4
       display.setCursor(17, 0);
 #else
@@ -7408,14 +7408,14 @@ void save_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
 #endif
       display.write(2); //fav symbol
 #ifdef DEBUG
-      Serial.println("Added to Favorites...");
+      Serial.println(F("Added to Favorites..."));
 #endif
     }
     else
     { // delete the file, is no longer a favorite
       SD.remove(tmp);
 #ifdef DEBUG
-      Serial.println("Removed from Favorites...");
+      Serial.println(F("Removed from Favorites..."));
 #endif
       for (i = 0; i < 32; i++) { //if no other favs exist in current bank, remove folder
         snprintf_P(tmp, sizeof(tmp), PSTR("/%s/%d/%d.fav"), FAV_CONFIG_PATH, b, i);
@@ -7425,9 +7425,9 @@ void save_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
         snprintf_P(tmp, sizeof(tmp), PSTR("/%s/%d"), FAV_CONFIG_PATH, b);
         SD.rmdir(tmp);
 #ifdef DEBUG
-        Serial.println("Fav count in bank:");
+        Serial.println(F("Fav count in bank:"));
         Serial.print(countfavs);
-        Serial.println("Removed folder since no voice in bank flagged as favorite any more");
+        Serial.println(F("Removed folder since no voice in bank flagged as favorite any more"));
 #endif
       }
 #ifdef TESTDISPLAY20x4
@@ -7437,7 +7437,7 @@ void save_favorite(uint8_t b, uint8_t v, uint8_t instance_id)
 #endif
       display.print(" "); //remove fav symbol
 #ifdef DEBUG
-      Serial.println("Removed from Favorites...");
+      Serial.println(F("Removed from Favorites..."));
 #endif
     }
   }
diff --git a/dexed_sd.cpp b/dexed_sd.cpp
index 515464d..83bfd90 100644
--- a/dexed_sd.cpp
+++ b/dexed_sd.cpp
@@ -527,7 +527,7 @@ bool save_sd_drumsettings_json(uint8_t number)
       AudioNoInterrupts();
       if (SD.exists(filename)) {
 #ifdef DEBUG
-        Serial.println("remove old drumsettings file");
+        Serial.println(F("remove old drumsettings file"));
 #endif
         SD.begin();
         SD.remove(filename);