diff --git a/src/engine/platform/gb.cpp b/src/engine/platform/gb.cpp
index fe9637362..9a5d6d7d4 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -82,8 +82,12 @@ void DivPlatformGB::acquire(short** buf, size_t len) {
 void DivPlatformGB::updateWave() {
   rWrite(0x1a,0);
   for (int i=0; i<16; i++) {
-    int nibble1=15-ws.output[((i<<1)+antiClickWavePos)&31];
-    int nibble2=15-ws.output[((1+(i<<1))+antiClickWavePos)&31];
+    int nibble1=ws.output[((i<<1)+antiClickWavePos)&31];
+    int nibble2=ws.output[((1+(i<<1))+antiClickWavePos)&31];
+    if (invertWave) {
+      nibble1^=15;
+      nibble2^=15;
+    }
     rWrite(0x30+i,(nibble1<<4)|nibble2);
   }
   antiClickWavePos&=31;
@@ -658,6 +662,7 @@ void DivPlatformGB::setFlags(const DivConfig& flags) {
       model=GB_MODEL_AGB;
       break;
   }
+  invertWave=flags.getBool("invertWave",true);
   enoughAlready=flags.getBool("enoughAlready",false);
 }
 
diff --git a/src/engine/platform/gb.h b/src/engine/platform/gb.h
index f75cc62c2..8ba70a913 100644
--- a/src/engine/platform/gb.h
+++ b/src/engine/platform/gb.h
@@ -57,6 +57,7 @@ class DivPlatformGB: public DivDispatch {
   DivDispatchOscBuffer* oscBuf[4];
   bool isMuted[4];
   bool antiClickEnabled;
+  bool invertWave;
   bool enoughAlready;
   unsigned char lastPan;
   DivWaveSynth ws;
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 3e36ad857..5da9ed32c 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -310,6 +310,7 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
     case DIV_SYSTEM_GB: {
       int chipType=flags.getInt("chipType",0);
       bool noAntiClick=flags.getBool("noAntiClick",false);
+      bool invertWave=flags.getBool("invertWave",true);
       bool enoughAlready=flags.getBool("enoughAlready",false);
 
       if (ImGui::Checkbox("Disable anti-click",&noAntiClick)) {
@@ -332,6 +333,26 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
         chipType=3;
         altered=true;
       }
+      ImGui::Text("Wave channel orientation:");
+      if (chipType==3) {
+        if (ImGui::RadioButton("Normal",!invertWave)) {
+          invertWave=false;
+          altered=true;
+        }
+        if (ImGui::RadioButton("Inverted",invertWave)) {
+          invertWave=true;
+          altered=true;
+        }
+      } else {
+        if (ImGui::RadioButton("Exact data (inverted)",!invertWave)) {
+          invertWave=false;
+          altered=true;
+        }
+        if (ImGui::RadioButton("Exact output (normal)",invertWave)) {
+          invertWave=true;
+          altered=true;
+        }
+      }
       if (ImGui::Checkbox("Pretty please one more compat flag when I use arpeggio and my sound length",&enoughAlready)) {
         altered=true;
       }
@@ -340,6 +361,7 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
         e->lockSave([&]() {
           flags.set("chipType",chipType);
           flags.set("noAntiClick",noAntiClick);
+          flags.set("invertWave",invertWave);
           flags.set("enoughAlready",enoughAlready);
         });
       }