diff --git a/src/gui/doAction.cpp b/src/gui/doAction.cpp
index 92ce732f..fc95c7ec 100644
--- a/src/gui/doAction.cpp
+++ b/src/gui/doAction.cpp
@@ -518,6 +518,9 @@ void FurnaceGUI::doAction(int what) {
     case GUI_ACTION_INS_LIST_OPEN:
       openFileDialog(GUI_FILE_INS_OPEN);
       break;
+    case GUI_ACTION_INS_LIST_OPEN_REPLACE:
+      openFileDialog(GUI_FILE_INS_OPEN_REPLACE);
+      break;
     case GUI_ACTION_INS_LIST_SAVE:
       if (curIns>=0 && curIns<(int)e->song.ins.size()) openFileDialog(GUI_FILE_INS_SAVE);
       break;
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index b922feab..01ef0b27 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1288,7 +1288,14 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
       );
       break;
     case GUI_FILE_INS_OPEN:
+    case GUI_FILE_INS_OPEN_REPLACE:
       prevIns=-3;
+      if (prevInsData!=NULL) {
+        delete prevInsData;
+        prevInsData=NULL;
+      }
+      prevInsData=new DivInstrument;
+      *prevInsData=*e->getIns(curIns);
       if (!dirExists(workingDirIns)) workingDirIns=getHomeDir();
       hasOpened=fileDialog->openLoad(
         "Load Instrument",
@@ -1300,11 +1307,20 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
         [this](const char* path) {
           std::vector<DivInstrument*> instruments=e->instrumentFromFile(path);
           if (!instruments.empty()) {
-            e->loadTempIns(instruments[0]);
-            if (curIns!=-2) {
-              prevIns=curIns;
+            if (curFileDialog==GUI_FILE_INS_OPEN_REPLACE) {
+              if (prevIns==-3) {
+                prevIns=curIns;
+              }
+              if (prevIns>=0 && prevIns<=(int)e->song.ins.size()) {
+                *e->song.ins[prevIns]=*instruments[0];
+              }
+            } else {
+              e->loadTempIns(instruments[0]);
+              if (curIns!=-2) {
+                prevIns=curIns;
+              }
+              curIns=-2;
             }
-            curIns=-2;
           }
           for (DivInstrument* i: instruments) delete i;
         }
@@ -2911,8 +2927,18 @@ bool FurnaceGUI::loop() {
     if (fileDialog->render(ImVec2(600.0f*dpiScale,400.0f*dpiScale),ImVec2(scrW*dpiScale,scrH*dpiScale))) {
       bool openOpen=false;
       //ImGui::GetIO().ConfigFlags&=~ImGuiConfigFlags_NavEnableKeyboard;
-      if (curFileDialog==GUI_FILE_INS_OPEN && prevIns!=-3) {
-        curIns=prevIns;
+      if ((curFileDialog==GUI_FILE_INS_OPEN || curFileDialog==GUI_FILE_INS_OPEN_REPLACE) && prevIns!=-3) {
+        if (curFileDialog==GUI_FILE_INS_OPEN_REPLACE) {
+          if (prevInsData!=NULL) {
+            logI("try");
+            if (prevIns>=0 && prevIns<(int)e->song.ins.size()) {
+              logI("replace");
+              *e->song.ins[prevIns]=*prevInsData;
+            }
+          }
+        } else {
+          curIns=prevIns;
+        }
         prevIns=-3;
       }
       switch (curFileDialog) {
@@ -2922,6 +2948,7 @@ bool FurnaceGUI::loop() {
           workingDirSong=fileDialog->getPath()+DIR_SEPARATOR_STR;
           break;
         case GUI_FILE_INS_OPEN:
+        case GUI_FILE_INS_OPEN_REPLACE:
         case GUI_FILE_INS_SAVE:
           workingDirIns=fileDialog->getPath()+DIR_SEPARATOR_STR;
           break;
@@ -3101,6 +3128,25 @@ bool FurnaceGUI::loop() {
               }
               break;
             }
+            case GUI_FILE_INS_OPEN_REPLACE: {
+              std::vector<DivInstrument*> instruments=e->instrumentFromFile(copyOfName.c_str());
+              if (!instruments.empty()) {
+                if (!e->getWarnings().empty()) {
+                  showWarning(e->getWarnings(),GUI_WARN_GENERIC);
+                }
+                if (curIns>=0 && curIns<(int)e->song.ins.size()) {
+                  *e->song.ins[0]=*instruments[0];
+                } else {
+                  showError("...but you haven't selected an instrument!");
+                }
+                for (DivInstrument* i: instruments) {
+                  delete i;
+                }
+              } else {
+                showError("cannot load instrument! ("+e->getLastError()+")");
+              }
+              break;
+            }
             case GUI_FILE_WAVE_OPEN:
               e->addWaveFromFile(copyOfName.c_str());
               MARK_MODIFIED;
@@ -3816,6 +3862,7 @@ FurnaceGUI::FurnaceGUI():
   patFont(NULL),
   bigFont(NULL),
   fontRange(NULL),
+  prevInsData(NULL),
   curIns(0),
   curWave(0),
   curSample(0),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index deabc889..99ca008b 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -239,6 +239,7 @@ enum FurnaceGUIFileDialogs {
   GUI_FILE_SAVE,
   GUI_FILE_SAVE_DMF_LEGACY,
   GUI_FILE_INS_OPEN,
+  GUI_FILE_INS_OPEN_REPLACE,
   GUI_FILE_INS_SAVE,
   GUI_FILE_WAVE_OPEN,
   GUI_FILE_WAVE_SAVE,
@@ -406,6 +407,7 @@ enum FurnaceGUIActions {
   GUI_ACTION_INS_LIST_ADD,
   GUI_ACTION_INS_LIST_DUPLICATE,
   GUI_ACTION_INS_LIST_OPEN,
+  GUI_ACTION_INS_LIST_OPEN_REPLACE,
   GUI_ACTION_INS_LIST_SAVE,
   GUI_ACTION_INS_LIST_MOVE_UP,
   GUI_ACTION_INS_LIST_MOVE_DOWN,
@@ -947,6 +949,8 @@ class FurnaceGUI {
 
   char finalLayoutPath[4096];
 
+  DivInstrument* prevInsData;
+
   int curIns, curWave, curSample, curOctave, curOrder, prevIns, oldRow, oldOrder, oldOrder1, editStep, exportLoops, soloChan, soloTimeout, orderEditMode, orderCursor;
   int loopOrder, loopRow, loopEnd, isClipping, extraChannelButtons, patNameTarget, newSongCategory, latchTarget;
   int wheelX, wheelY;
diff --git a/src/gui/guiConst.cpp b/src/gui/guiConst.cpp
index ca064739..3cbd8204 100644
--- a/src/gui/guiConst.cpp
+++ b/src/gui/guiConst.cpp
@@ -560,6 +560,7 @@ const FurnaceGUIActionDef guiActions[GUI_ACTION_MAX]={
   D("INS_LIST_ADD", "Add", SDLK_INSERT),
   D("INS_LIST_DUPLICATE", "Duplicate", FURKMOD_CMD|SDLK_d),
   D("INS_LIST_OPEN", "Open", 0),
+  D("INS_LIST_OPEN_REPLACE", "Open (replace current)", 0),
   D("INS_LIST_SAVE", "Save", 0),
   D("INS_LIST_MOVE_UP", "Move up", FURKMOD_SHIFT|SDLK_UP),
   D("INS_LIST_MOVE_DOWN", "Move down", FURKMOD_SHIFT|SDLK_DOWN),
diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index 8d3ea74a..ed776524 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -1378,7 +1378,7 @@ void FurnaceGUI::drawInsEdit() {
         ImGui::TableNextColumn();
         // TODO: load replace
         if (ImGui::Button(ICON_FA_FOLDER_OPEN "##IELoad")) {
-          doAction(GUI_ACTION_INS_LIST_OPEN);
+          doAction(GUI_ACTION_INS_LIST_OPEN_REPLACE);
         }
         ImGui::SameLine();
         if (ImGui::Button(ICON_FA_FLOPPY_O "##IESave")) {
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index 1d171dd0..5d79ebce 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -1616,6 +1616,7 @@ void FurnaceGUI::drawSettings() {
             UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_ADD);
             UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_DUPLICATE);
             UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_OPEN);
+            UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_OPEN_REPLACE);
             UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_SAVE);
             UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_MOVE_UP);
             UI_KEYBIND_CONFIG(GUI_ACTION_INS_LIST_MOVE_DOWN);