diff --git a/TODO.md b/TODO.md
index 46773705a..13f31300e 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,6 +1,5 @@
 # to-do for 0.6pre1.5-0.6pre2
 
-- Game Boy envelope macro/sequence
 - volume commands should work on Game Boy
 - ability to customize `OFF`, `===` and `REL`
 - stereo separation control for AY
diff --git a/papers/format.md b/papers/format.md
index 263955022..1a8cd7219 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -32,7 +32,8 @@ these fields are 0 in format versions prior to 100 (0.6pre1).
 
 the format versions are:
 
-- 105: Furance dev105
+- 106: Furnace dev106
+- 105: Furnace dev105
 - 104: Furnace dev104
 - 103: Furnace dev103
 - 102: Furnace 0.6pre1 (dev102)
@@ -846,6 +847,9 @@ size | description
      |   - 2 bytes: nothing
      | - for loop/loop until release:
      |   - 2 bytes: position
+ --- | **Game Boy extra flags** (>=106)
+  1  | use software envelope
+  1  | always init hard env on new note
 ```
 
 # wavetable
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 001ea1941..483ebcf0d 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -45,8 +45,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev105"
-#define DIV_ENGINE_VERSION 105
+#define DIV_VERSION "dev106"
+#define DIV_ENGINE_VERSION 106
 
 // for imports
 #define DIV_VERSION_MOD 0xff01
diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index b1afc3953..555d7d17f 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -539,6 +539,10 @@ void DivInstrument::putInsData(SafeWriter* w) {
     w->writeS(gb.hwSeq[i].data);
   }
 
+  // GB additional flags
+  w->writeC(gb.softEnv);
+  w->writeC(gb.alwaysInit);
+
   blockEndSeek=w->tell();
   w->seek(blockStartSeek,SEEK_SET);
   w->writeI(blockEndSeek-blockStartSeek-4);
@@ -1101,6 +1105,12 @@ DivDataErrors DivInstrument::readInsData(SafeReader& reader, short version) {
     }
   }
 
+  // GB additional flags
+  if (version>=106) {
+    gb.softEnv=reader.readC();
+    gb.alwaysInit=reader.readC();
+  }
+
   return DIV_DATA_SUCCESS;
 }
 
diff --git a/src/engine/instrument.h b/src/engine/instrument.h
index eddf9f79e..df7a6b361 100644
--- a/src/engine/instrument.h
+++ b/src/engine/instrument.h
@@ -262,6 +262,7 @@ struct DivInstrumentSTD {
 
 struct DivInstrumentGB {
   unsigned char envVol, envDir, envLen, soundLen, hwSeqLen;
+  bool softEnv, alwaysInit;
   enum HWSeqCommands: unsigned char {
     DIV_GB_HWCMD_ENVELOPE=0,
     DIV_GB_HWCMD_SWEEP,
@@ -281,7 +282,9 @@ struct DivInstrumentGB {
     envDir(0),
     envLen(2),
     soundLen(64),
-    hwSeqLen(0) {
+    hwSeqLen(0),
+    softEnv(false),
+    alwaysInit(false) {
     memset(hwSeq,0,256*sizeof(int));
   }
 };
diff --git a/src/engine/platform/gb.cpp b/src/engine/platform/gb.cpp
index 2ec9bfdf9..5b7393ef3 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -233,12 +233,61 @@ void DivPlatformGB::tick(bool sysTick) {
         }
       }
     }
+    // run hardware sequence
+    if (chan[i].active) {
+      if (--chan[i].hwSeqDelay<=0) {
+        chan[i].hwSeqDelay=0;
+        DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_GB);
+        int hwSeqCount=0;
+        while (chan[i].hwSeqPos<ins->gb.hwSeqLen && hwSeqCount<4) {
+          bool leave=false;
+          unsigned short data=ins->gb.hwSeq[chan[i].hwSeqPos].data;
+          switch (ins->gb.hwSeq[chan[i].hwSeqPos].cmd) {
+            case DivInstrumentGB::DIV_GB_HWCMD_ENVELOPE:
+              chan[i].envLen=data&7;
+              chan[i].envDir=(data&8)?1:0;
+              chan[i].envVol=(data>>4)&15;
+              chan[i].soundLen=data>>8;
+              chan[i].keyOn=true;
+              break;
+            case DivInstrumentGB::DIV_GB_HWCMD_SWEEP:
+              chan[i].sweep=data;
+              chan[i].sweepChanged=true;
+              break;
+            case DivInstrumentGB::DIV_GB_HWCMD_WAIT:
+              chan[i].hwSeqDelay=data+1;
+              leave=true;
+              break;
+            case DivInstrumentGB::DIV_GB_HWCMD_WAIT_REL:
+              if (!chan[i].released) {
+                chan[i].hwSeqPos--;
+                leave=true;
+              }
+              break;
+            case DivInstrumentGB::DIV_GB_HWCMD_LOOP:
+              chan[i].hwSeqPos=data-1;
+              break;
+            case DivInstrumentGB::DIV_GB_HWCMD_LOOP_REL:
+              if (!chan[i].released) {
+                chan[i].hwSeqPos=data-1;
+              }
+              break;
+          }
+
+          chan[i].hwSeqPos++;
+          if (leave) break;
+          hwSeqCount++;
+        }
+      }
+    }
+
     if (chan[i].sweepChanged) {
       chan[i].sweepChanged=false;
       if (i==0) {
         rWrite(16+i*5,chan[i].sweep);
       }
     }
+
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       if (i==3) { // noise
         int ntPos=chan[i].baseFreq;
@@ -300,6 +349,9 @@ int DivPlatformGB::dispatch(DivCommand c) {
       }
       chan[c.chan].active=true;
       chan[c.chan].keyOn=true;
+      chan[c.chan].hwSeqPos=0;
+      chan[c.chan].hwSeqDelay=0;
+      chan[c.chan].released=false;
       chan[c.chan].macroInit(ins);
       if (c.chan==2) {
         if (chan[c.chan].wave<0) {
@@ -308,7 +360,7 @@ int DivPlatformGB::dispatch(DivCommand c) {
         }
         ws.init(ins,32,15,chan[c.chan].insChanged);
       }
-      if (chan[c.chan].insChanged) {
+      if (chan[c.chan].insChanged || ins->gb.alwaysInit) {
         chan[c.chan].envVol=ins->gb.envVol;
         chan[c.chan].envLen=ins->gb.envLen;
         chan[c.chan].envDir=ins->gb.envDir;
@@ -320,11 +372,14 @@ int DivPlatformGB::dispatch(DivCommand c) {
     case DIV_CMD_NOTE_OFF:
       chan[c.chan].active=false;
       chan[c.chan].keyOff=true;
+      chan[c.chan].hwSeqPos=0;
+      chan[c.chan].hwSeqDelay=0;
       chan[c.chan].macroInit(NULL);
       break;
     case DIV_CMD_NOTE_OFF_ENV:
     case DIV_CMD_ENV_RELEASE:
       chan[c.chan].std.release();
+      chan[c.chan].released=true;
       break;
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
diff --git a/src/engine/platform/gb.h b/src/engine/platform/gb.h
index 58cce8805..a4432f1e7 100644
--- a/src/engine/platform/gb.h
+++ b/src/engine/platform/gb.h
@@ -29,10 +29,11 @@ class DivPlatformGB: public DivDispatch {
   struct Channel {
     int freq, baseFreq, pitch, pitch2, note, ins;
     unsigned char duty, sweep;
-    bool active, insChanged, freqChanged, sweepChanged, keyOn, keyOff, inPorta;
+    bool active, insChanged, freqChanged, sweepChanged, keyOn, keyOff, inPorta, released;
     signed char vol, outVol, wave;
     unsigned char envVol, envDir, envLen, soundLen;
-    unsigned short hwSeqPos, hwSeqDelay;
+    unsigned short hwSeqPos;
+    short hwSeqDelay;
     DivMacroInt std;
     void macroInit(DivInstrument* which) {
       std.init(which);
@@ -54,6 +55,7 @@ class DivPlatformGB: public DivDispatch {
       keyOn(false),
       keyOff(false),
       inPorta(false),
+      released(false),
       vol(15),
       outVol(15),
       wave(-1),
diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index e0c18b6c1..ce9406ba1 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -2965,6 +2965,10 @@ void FurnaceGUI::drawInsEdit() {
           }
         }
         if (ins->type==DIV_INS_GB) if (ImGui::BeginTabItem("Game Boy")) {
+          P(ImGui::Checkbox("Use software envelope",&ins->gb.softEnv));
+          P(ImGui::Checkbox("Initialize envelope on every note",&ins->gb.alwaysInit));
+
+          ImGui::BeginDisabled(ins->gb.softEnv);
           P(CWSliderScalar("Volume",ImGuiDataType_U8,&ins->gb.envVol,&_ZERO,&_FIFTEEN)); rightClickable
           P(CWSliderScalar("Envelope Length",ImGuiDataType_U8,&ins->gb.envLen,&_ZERO,&_SEVEN)); rightClickable
           P(CWSliderScalar("Sound Length",ImGuiDataType_U8,&ins->gb.soundLen,&_ZERO,&_SIXTY_FOUR,ins->gb.soundLen>63?"Infinity":"%d")); rightClickable
@@ -3060,13 +3064,13 @@ void FurnaceGUI::drawInsEdit() {
                       somethingChanged=true;
                     }
 
-                    if (ImGui::RadioButton("Up",hwsDir)) { PARAMETER
-                      hwsDir=true;
+                    if (ImGui::RadioButton("Up",!hwsDir)) { PARAMETER
+                      hwsDir=false;
                       somethingChanged=true;
                     }
                     ImGui::SameLine();
-                    if (ImGui::RadioButton("Down",!hwsDir)) { PARAMETER
-                      hwsDir=false;
+                    if (ImGui::RadioButton("Down",hwsDir)) { PARAMETER
+                      hwsDir=true;
                       somethingChanged=true;
                     }
 
@@ -3128,6 +3132,7 @@ void FurnaceGUI::drawInsEdit() {
             }
 
             ImGui::EndChild();
+            ImGui::EndDisabled();
           }
           ImGui::EndTabItem();
         }
@@ -3689,8 +3694,10 @@ void FurnaceGUI::drawInsEdit() {
           if (ins->type==DIV_INS_FM || ins->type==DIV_INS_MIKEY || ins->type==DIV_INS_MULTIPCM || ins->type==DIV_INS_SU) {
             volMax=127;
           }
-          if (ins->type==DIV_INS_GB) {
+          if (ins->type==DIV_INS_GB && !ins->gb.softEnv) {
             volMax=0;
+          } else {
+            volMax=15;
           }
           if (ins->type==DIV_INS_PET || ins->type==DIV_INS_BEEPER) {
             volMax=1;