diff --git a/papers/format.md b/papers/format.md
index e8f076176..2f4037a06 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -29,6 +29,7 @@ furthermore, an `or reserved` indicates this field is always present, but is res
 
 the format versions are:
 
+- 83: Furnace dev83
 - 82: Furnace dev82
 - 81: Furnace dev81
 - 80: Furnace dev80
@@ -266,7 +267,9 @@ size | description
   1  | buggy portamento after slide (>=72) or reserved
   1  | new ins affects envelope (Game Boy) (>=72) or reserved
   1  | ExtCh channel state is shared (>=78) or reserved
- 25  | reserved
+  1  | ignore DAC mode change outside of intended channel (>=83) or reserved
+  1  | E1xx and E2xx also take priority over Slide00 (>=83) or reserved
+ 23  | reserved
 ```
 
 # instrument
diff --git a/src/engine/engine.h b/src/engine/engine.h
index d11c54709..6b93666bf 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -42,8 +42,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev82"
-#define DIV_ENGINE_VERSION 82
+#define DIV_VERSION "dev83"
+#define DIV_ENGINE_VERSION 83
 
 // for imports
 #define DIV_VERSION_MOD 0xff01
diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index 356e40e7e..6e91ac4aa 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -154,6 +154,8 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
     ds.ignoreJumpAtEnd=true;
     ds.buggyPortaAfterSlide=true;
     ds.gbInsAffectsEnvelope=true;
+    ds.ignoreDACModeOutsideIntendedChannel=false;
+    ds.e1e2AlsoTakePriority=true;
 
     // 1.1 compat flags
     if (ds.version>24) {
@@ -1315,7 +1317,14 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       } else {
         reader.readC();
       }
-      for (int i=0; i<25; i++) {
+      if (ds.version>=82) {
+        ds.ignoreDACModeOutsideIntendedChannel=reader.readC();
+        ds.e1e2AlsoTakePriority=reader.readC();
+      } else {
+        reader.readC();
+        reader.readC();
+      }
+      for (int i=0; i<23; i++) {
         reader.readC();
       }
     }
@@ -2219,7 +2228,9 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
   w->writeC(song.buggyPortaAfterSlide);
   w->writeC(song.gbInsAffectsEnvelope);
   w->writeC(song.sharedExtStat);
-  for (int i=0; i<25; i++) {
+  w->writeC(song.ignoreDACModeOutsideIntendedChannel);
+  w->writeC(song.e1e2AlsoTakePriority);
+  for (int i=0; i<23; i++) {
     w->writeC(0);
   }
 
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index 60f877b7e..e8ddbdc79 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -156,9 +156,21 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_SAMPLE_MODE: {
-      // ignored on extended channel 3 mode.
+      // not ignored actually!
+      if (!parent->song.ignoreDACModeOutsideIntendedChannel) {
+        dacMode=c.value;
+        rWrite(0x2b,c.value<<7);
+      }
       break;
     }
+    case DIV_CMD_SAMPLE_BANK:
+      if (!parent->song.ignoreDACModeOutsideIntendedChannel) {
+        sampleBank=c.value;
+        if (sampleBank>(parent->song.sample.size()/12)) {
+          sampleBank=parent->song.sample.size()/12;
+        }
+      }
+      break;
     case DIV_CMD_LEGATO: {
       opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
       opChan[ch].freqChanged=true;
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index 97047b64d..05cb890c5 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -1174,6 +1174,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
           chan[i].inPorta=true;
           chan[i].shorthandPorta=true;
           if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,true,0));
+          if (song.e1e2AlsoTakePriority) lastSlide=0x1337; // ...
         } else {
           chan[i].inPorta=false;
           if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,false,0));
@@ -1190,6 +1191,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
           chan[i].inPorta=true;
           chan[i].shorthandPorta=true;
           if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,true,0));
+          if (song.e1e2AlsoTakePriority) lastSlide=0x1337; // ...
         } else {
           chan[i].inPorta=false;
           if (!song.brokenShortcutSlides) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,false,0));
diff --git a/src/engine/song.h b/src/engine/song.h
index 009b40980..6cda7c533 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -321,6 +321,8 @@ struct DivSong {
   bool buggyPortaAfterSlide;
   bool gbInsAffectsEnvelope;
   bool sharedExtStat;
+  bool ignoreDACModeOutsideIntendedChannel;
+  bool e1e2AlsoTakePriority;
 
   DivOrders orders;
   std::vector<DivInstrument*> ins;
@@ -400,7 +402,9 @@ struct DivSong {
     ignoreJumpAtEnd(false),
     buggyPortaAfterSlide(false),
     gbInsAffectsEnvelope(true),
-    sharedExtStat(true) {
+    sharedExtStat(true),
+    ignoreDACModeOutsideIntendedChannel(false),
+    e1e2AlsoTakePriority(false) {
     for (int i=0; i<32; i++) {
       system[i]=DIV_SYSTEM_NULL;
       systemVol[i]=64;
diff --git a/src/gui/compatFlags.cpp b/src/gui/compatFlags.cpp
index 15a900b2d..8a45741f8 100644
--- a/src/gui/compatFlags.cpp
+++ b/src/gui/compatFlags.cpp
@@ -105,6 +105,14 @@ void FurnaceGUI::drawCompatFlags() {
     if (ImGui::IsItemHovered()) {
       ImGui::SetTooltip("if this is on, an instrument change will also affect the envelope.");
     }
+    ImGui::Checkbox("Ignore DAC mode change outside of intended channel in ExtCh mode",&e->song.ignoreDACModeOutsideIntendedChannel);
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("if this is on, 17xx has no effect on the operator channels in YM2612.");
+    }
+    ImGui::Checkbox("E1xy/E2xy also take priority over slide stops",&e->song.e1e2AlsoTakePriority);
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("does this make any sense by now?");
+    }
 
     ImGui::Text("Loop modality:");
     if (ImGui::RadioButton("Reset channels",e->song.loopModality==0)) {