diff --git a/source/duke3d/src/gamedef.cpp b/source/duke3d/src/gamedef.cpp
index 80c9bbbb8..69c365407 100644
--- a/source/duke3d/src/gamedef.cpp
+++ b/source/duke3d/src/gamedef.cpp
@@ -380,6 +380,7 @@ static tokenmap_t const vm_keywords[] =
     { "precache",               CON_PRECACHE },
     { "prevspritesect",         CON_PREVSPRITESECT },
     { "prevspritestat",         CON_PREVSPRITESTAT },
+    { "preloadtrackslotforswap", CON_PRELOADTRACKSLOTFORSWAP },
     { "pstomp",                 CON_PSTOMP },
     { "qgetsysstr",             CON_QGETSYSSTR },
     { "qspawnvar",              CON_QSPAWNVAR },
@@ -492,6 +493,7 @@ static tokenmap_t const vm_keywords[] =
     { "subvar",                 CON_SUBVAR },
     { "subvarvar",              CON_SUBVARVAR },
     { "switch",                 CON_SWITCH },
+    { "swaptrackslot",          CON_SWAPTRACKSLOT },
     { "time",                   CON_TIME },
     { "tip",                    CON_TIP },
     { "tossweapon",             CON_TOSSWEAPON },
@@ -4205,6 +4207,8 @@ DO_DEFSTATE:
         case CON_ACTORSOUND:
         case CON_STOPACTORSOUND:
         case CON_STARTTRACKSLOT:
+        case CON_SWAPTRACKSLOT:
+        case CON_PRELOADTRACKSLOTFORSWAP:
             C_GetManyVars(2);
             continue;
 
diff --git a/source/duke3d/src/gamedef.h b/source/duke3d/src/gamedef.h
index 4b0c59729..aaf2cabd3 100644
--- a/source/duke3d/src/gamedef.h
+++ b/source/duke3d/src/gamedef.h
@@ -1208,6 +1208,8 @@ enum ScriptKeywords_t
     CON_QSTRCMP,            // 411
     CON_DIVR,               // 412
     CON_DIVRU,              // 413
+    CON_SWAPTRACKSLOT,      // 414
+    CON_PRELOADTRACKSLOTFORSWAP, // 415
     CON_END
 };
 // KEEPINSYNC with the keyword list in lunatic/con_lang.lua
diff --git a/source/duke3d/src/gameexec.cpp b/source/duke3d/src/gameexec.cpp
index 35af21d38..86763f3c9 100644
--- a/source/duke3d/src/gameexec.cpp
+++ b/source/duke3d/src/gameexec.cpp
@@ -1146,11 +1146,16 @@ static int G_StartTrackSlot(int const volumeNum, int const levelNum)
 }
 
 #ifndef LUNATIC
-static void G_StartTrackSlotWrap(int const volumeNum, int const levelNum)
+static int G_StartTrackSlotWrap(int const volumeNum, int const levelNum)
 {
     if (EDUKE32_PREDICT_FALSE(G_StartTrackSlot(volumeNum, levelNum)))
+    {
         CON_ERRPRINTF("invalid level %d or null music for volume %d level %d\n",
                       levelNum, volumeNum, levelNum);
+        return 1;
+    }
+
+    return 0;
 }
 #else
 int G_StartTrack(int const levelNum)
@@ -5054,6 +5059,29 @@ finish_qsprintf:
             }
             continue;
 
+        case CON_SWAPTRACKSLOT:
+            insptr++;
+            {
+                int const volumeNum = Gv_GetVarX(*(insptr++));
+                int const levelNum = Gv_GetVarX(*(insptr++));
+
+                if (volumeNum == ud.music_episode && levelNum == ud.music_level)
+                    continue;
+
+                // This is the best ASS can do right now. Better implementation pending.
+                int32_t position = S_GetMusicPosition();
+                if (!G_StartTrackSlotWrap(volumeNum == -1 ? MAXVOLUMES : volumeNum, levelNum))
+                    S_SetMusicPosition(position);
+            }
+            continue;
+
+        case CON_PRELOADTRACKSLOTFORSWAP:
+            // ASS can't even handle this command right now.
+            insptr++;
+            Gv_GetVarX(*(insptr++));
+            Gv_GetVarX(*(insptr++));
+            continue;
+
         case CON_SETMUSICPOSITION:
             insptr++;
             Gv_GetVarX(*(insptr++));