diff --git a/papers/format.md b/papers/format.md
index 5d227f13e..c4d9d8a6a 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -165,6 +165,7 @@ size | description
   1  | target resets slides (>=45) or reserved
   1  | arpeggio inhibits portamento (>=47) or reserved
   1  | wack algorithm macro (>=47) or reserved
+  1  | broken shortcut slides (>=49) or reserved
   8  | reserved
  4?? | pointers to instruments
  4?? | pointers to wavetables
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index bbedb6ef8..86a5be350 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -1564,6 +1564,7 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
     ds.targetResetsSlides=true;
     ds.arpNonPorta=false;
     ds.algMacroBehavior=false;
+    ds.brokenShortcutSlides=false;
 
     // Neo Geo detune
     if (ds.system[0]==DIV_SYSTEM_YM2610 || ds.system[0]==DIV_SYSTEM_YM2610_EXT) {
@@ -2113,6 +2114,9 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       ds.arpNonPorta=false;
       ds.algMacroBehavior=false;
     }
+    if (ds.version<49) {
+      ds.brokenShortcutSlides=true;
+    }
 
     reader.readS(); // reserved
     int infoSeek=reader.readI();
@@ -2230,7 +2234,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       } else {
         reader.readC();
       }
-      for (int i=0; i<8; i++) reader.readC();
+      if (ds.version>=49) {
+        ds.brokenShortcutSlides=reader.readC();
+      } else {
+        reader.readC();
+      }
+      for (int i=0; i<7; i++) reader.readC();
     } else {
       for (int i=0; i<20; i++) reader.readC();
     }
@@ -2613,7 +2622,8 @@ SafeWriter* DivEngine::saveFur() {
   w->writeC(song.targetResetsSlides);
   w->writeC(song.arpNonPorta);
   w->writeC(song.algMacroBehavior);
-  for (int i=0; i<8; i++) {
+  w->writeC(song.brokenShortcutSlides);
+  for (int i=0; i<7; i++) {
     w->writeC(0);
   }
 
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 637156b01..a1d4b0d37 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -30,8 +30,8 @@
 #include <map>
 #include <queue>
 
-#define DIV_VERSION "0.5.6"
-#define DIV_ENGINE_VERSION 48
+#define DIV_VERSION "0.5.7pre1"
+#define DIV_ENGINE_VERSION 49
 
 enum DivStatusView {
   DIV_STATUS_NOTHING=0,
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index 3539800e5..663219141 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -685,8 +685,10 @@ void DivEngine::processRow(int i, bool afterDelay) {
         if ((effectVal&15)!=0) {
           chan[i].inPorta=true;
           chan[i].shorthandPorta=true;
+          if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,true,0));
         } else {
           chan[i].inPorta=false;
+          if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,false,0));
         }
         break;
       case 0xe2: // portamento down
@@ -699,8 +701,10 @@ void DivEngine::processRow(int i, bool afterDelay) {
         if ((effectVal&15)!=0) {
           chan[i].inPorta=true;
           chan[i].shorthandPorta=true;
+          if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,true,0));
         } else {
           chan[i].inPorta=false;
+          if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,false,0));
         }
         break;
       case 0xe3: // vibrato direction
diff --git a/src/engine/song.h b/src/engine/song.h
index 06ce12ec6..de57a78ff 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -245,6 +245,7 @@ struct DivSong {
   bool targetResetsSlides;
   bool arpNonPorta;
   bool algMacroBehavior;
+  bool brokenShortcutSlides;
 
   DivOrders orders;
   std::vector<DivInstrument*> ins;
@@ -302,7 +303,8 @@ struct DivSong {
     noteOffResetsSlides(true),
     targetResetsSlides(true),
     arpNonPorta(false),
-    algMacroBehavior(false) {
+    algMacroBehavior(false),
+    brokenShortcutSlides(false) {
     for (int i=0; i<32; i++) {
       system[i]=DIV_SYSTEM_NULL;
       systemVol[i]=64;
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 93bf3f44b..715f32379 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1843,6 +1843,10 @@ void FurnaceGUI::drawCompatFlags() {
     if (ImGui::IsItemHovered()) {
       ImGui::SetTooltip("behavior changed in 0.5.5");
     }
+    ImGui::Checkbox("Broken shortcut slides (E1xy/E2xy)",&e->song.brokenShortcutSlides);
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("behavior changed in 0.5.7");
+    }
   }
   if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) curWindow=GUI_WINDOW_COMPAT_FLAGS;
   ImGui::End();