diff --git a/src/gui/compatFlags.cpp b/src/gui/compatFlags.cpp
index efa88feec..50fb3b0cd 100644
--- a/src/gui/compatFlags.cpp
+++ b/src/gui/compatFlags.cpp
@@ -210,11 +210,15 @@ void FurnaceGUI::drawCompatFlags() {
         if (ImGui::IsItemHovered()) {
           ImGui::SetTooltip("like ProTracker/FamiTracker");
         }
-        if (ImGui::RadioButton("Partial (only 04xy/E5xx)",e->song.linearPitch==1)) {
-          e->song.linearPitch=1;
-        }
-        if (ImGui::IsItemHovered()) {
-          ImGui::SetTooltip("like DefleMask");
+        if (e->song.linearPitch==1) {
+          pushWarningColor(true);
+          if (ImGui::RadioButton("Partial (only 04xy/E5xx)",e->song.linearPitch==1)) {
+            e->song.linearPitch=1;
+          }
+          if (ImGui::IsItemHovered()) {
+            ImGui::SetTooltip("like DefleMask\n\nthis pitch linearity mode is deprecated due to:\n- excessive complexity\n- lack of possible optimization\n\nit is recommended to change it now because I will remove this option in the future!");
+          }
+          popWarningColor();
         }
         if (ImGui::RadioButton("Full",e->song.linearPitch==2)) {
           e->song.linearPitch=2;
diff --git a/src/gui/gui.h b/src/gui/gui.h
index cdf676303..280f9debf 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1517,6 +1517,7 @@ class FurnaceGUI {
     int noMultiSystem;
     int oldMacroVSlider;
     int displayAllInsTypes;
+    int displayPartial;
     int noteCellSpacing;
     int insCellSpacing;
     int volCellSpacing;
@@ -1694,6 +1695,7 @@ class FurnaceGUI {
       noMultiSystem(0),
       oldMacroVSlider(0),
       displayAllInsTypes(0),
+      displayPartial(0),
       noteCellSpacing(0),
       insCellSpacing(0),
       volCellSpacing(0),
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index e36a6bdd9..aebc14e1f 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -3032,6 +3032,7 @@ void FurnaceGUI::drawSettings() {
         // "Debug" - toggles mobile UI
         // "Nice Amiga cover of the song!" - enables hidden systems (YMU759/SoundUnit/Dummy)
         // "42 63" - enables all instrument types
+        // "4-bit FDS" - enables partial pitch linearity option
         // "????" - enables stuff
         CONFIG_SECTION("Cheat Codes") {
           // SUBSECTION ENTER CODE:
@@ -3219,6 +3220,7 @@ void FurnaceGUI::syncSettings() {
   settings.noMultiSystem=e->getConfInt("noMultiSystem",0);
   settings.oldMacroVSlider=e->getConfInt("oldMacroVSlider",0);
   settings.displayAllInsTypes=e->getConfInt("displayAllInsTypes",0);
+  settings.displayPartial=e->getConfInt("displayPartial",0);
   settings.noteCellSpacing=e->getConfInt("noteCellSpacing",0);
   settings.insCellSpacing=e->getConfInt("insCellSpacing",0);
   settings.volCellSpacing=e->getConfInt("volCellSpacing",0);
@@ -3377,6 +3379,7 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.noMultiSystem,0,1);
   clampSetting(settings.oldMacroVSlider,0,1);
   clampSetting(settings.displayAllInsTypes,0,1);
+  clampSetting(settings.displayPartial,0,1);
   clampSetting(settings.noteCellSpacing,0,32);
   clampSetting(settings.insCellSpacing,0,32);
   clampSetting(settings.volCellSpacing,0,32);
@@ -3625,6 +3628,7 @@ void FurnaceGUI::commitSettings() {
   e->setConf("noMultiSystem",settings.noMultiSystem);
   e->setConf("oldMacroVSlider",settings.oldMacroVSlider);
   e->setConf("displayAllInsTypes",settings.displayAllInsTypes);
+  e->setConf("displayPartial",settings.displayPartial);
   e->setConf("noteCellSpacing",settings.noteCellSpacing);
   e->setConf("insCellSpacing",settings.insCellSpacing);
   e->setConf("volCellSpacing",settings.volCellSpacing);