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/doc/7-systems/opz.md b/papers/doc/7-systems/opz.md
index 61e931394..c7952a55b 100644
--- a/papers/doc/7-systems/opz.md
+++ b/papers/doc/7-systems/opz.md
@@ -1,5 +1,7 @@
 # Yamaha OPZ (YM2414)
 
+**disclaimer: despite the name, this has nothing to do with teenage engineering's OP-Z synth!**
+
 this is the YM2151's little-known successor, used in the Yamaha TX81Z and a few other Yamaha synthesizers. oh, and the Korg Z3 too.
 
 it adds these features on top of the YM2151:
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 6d49d710a..c538ebfe0 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/fileOps.cpp b/src/engine/fileOps.cpp
index 76cff9df8..7cd900221 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -590,7 +590,9 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
 
           logD("GB data: vol %d dir %d len %d sl %d",ins->gb.envVol,ins->gb.envDir,ins->gb.envLen,ins->gb.soundLen);
         } else if (ds.system[0]==DIV_SYSTEM_GB) {
-          // try to convert macro to envelope
+          // set software envelope flag
+          ins->gb.softEnv=true;
+          // try to convert macro to envelope in case the user decides to switch to them
           if (ins->std.volMacro.len>0) {
             ins->gb.envVol=ins->std.volMacro.val[0];
             if (ins->std.volMacro.val[0]<ins->std.volMacro.val[1]) {
@@ -600,7 +602,6 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
               ins->gb.soundLen=ins->std.volMacro.len*2;
             }
           }
-          addWarning("Game Boy volume macros converted to envelopes. may not be perfect!");
         }
       }
 
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..0a8b624c9 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -21,8 +21,8 @@
 #include "../engine.h"
 #include <math.h>
 
-#define rWrite(a,v) if (!skipRegisterWrites) {GB_apu_write(gb,a,v); regPool[(a)&0x7f]=v; if (dumpWrites) {addWrite(a,v);} }
-#define immWrite(a,v) {GB_apu_write(gb,a,v); regPool[(a)&0x7f]=v; if (dumpWrites) {addWrite(a,v);} }
+#define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); regPool[(a)&0x7f]=v; if (dumpWrites) {addWrite(a,v);} }
+#define immWrite(a,v) {writes.emplace(a,v); regPool[(a)&0x7f]=v; if (dumpWrites) {addWrite(a,v);} }
 
 #define CHIP_DIVIDER 16
 
@@ -84,6 +84,12 @@ const char* DivPlatformGB::getEffectName(unsigned char effect) {
 
 void DivPlatformGB::acquire(short* bufL, short* bufR, size_t start, size_t len) {
   for (size_t i=start; i<start+len; i++) {
+    if (!writes.empty()) {
+      QueuedWrite& w=writes.front();
+      GB_apu_write(gb,w.addr,w.val);
+      writes.pop();
+    }
+
     GB_advance_cycles(gb,16);
     bufL[i]=gb->apu_output.final_sample.left;
     bufR[i]=gb->apu_output.final_sample.right;
@@ -97,8 +103,8 @@ void DivPlatformGB::acquire(short* bufL, short* bufR, size_t start, 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=15-ws.output[((i<<1)+antiClickWavePos-1)&31];
+    int nibble2=15-ws.output[((1+(i<<1))+antiClickWavePos-1)&31];
     rWrite(0x30+i,(nibble1<<4)|nibble2);
   }
   antiClickWavePos&=31;
@@ -160,6 +166,25 @@ void DivPlatformGB::tick(bool sysTick) {
 
   for (int i=0; i<4; i++) {
     chan[i].std.next();
+    if (chan[i].softEnv) {
+      if (chan[i].std.vol.had) {
+        chan[i].outVol=VOL_SCALE_LINEAR(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
+        if (chan[i].outVol<0) chan[i].outVol=0;
+
+        if (i==2) {
+          rWrite(16+i*5+2,gbVolMap[chan[i].outVol]);
+          chan[i].soundLen=64;
+        } else {
+          chan[i].envLen=0;
+          chan[i].envDir=1;
+          chan[i].envVol=chan[i].outVol;
+          chan[i].soundLen=64;
+
+          if (!chan[i].keyOn) chan[i].killIt=true;
+          chan[i].freqChanged=true;
+        }
+      }
+    }
     if (chan[i].std.arp.had) {
       if (i==3) { // noise
         if (chan[i].std.arp.mode) {
@@ -189,7 +214,7 @@ void DivPlatformGB::tick(bool sysTick) {
       chan[i].duty=chan[i].std.duty.val;
       if (i!=2) {
         rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(chan[i].soundLen&63)));
-      } else {
+      } else if (!chan[i].softEnv) {
         if (parent->song.waveDutyIsVol) {
           rWrite(16+i*5+2,gbVolMap[(chan[i].std.duty.val&3)<<2]);
         }
@@ -233,12 +258,63 @@ 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:
+              if (!chan[i].softEnv) {
+                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;
@@ -253,10 +329,11 @@ void DivPlatformGB::tick(bool sysTick) {
       if (chan[i].keyOn) {
         if (i==2) { // wave
           rWrite(16+i*5,0x80);
-          rWrite(16+i*5+2,gbVolMap[chan[i].vol]);
+          rWrite(16+i*5+2,gbVolMap[chan[i].outVol]);
         } else {
           rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(chan[i].soundLen&63)));
-          rWrite(16+i*5+2,((chan[i].vol<<4))|(chan[i].envLen&7)|((chan[i].envDir&1)<<3));
+          rWrite(16+i*5+2,((chan[i].envVol<<4))|(chan[i].envLen&7)|((chan[i].envDir&1)<<3));
+          chan[i].lastKill=chan[i].envVol;
         }
       }
       if (chan[i].keyOff) {
@@ -276,6 +353,25 @@ void DivPlatformGB::tick(bool sysTick) {
       if (chan[i].keyOn) chan[i].keyOn=false;
       if (chan[i].keyOff) chan[i].keyOff=false;
       chan[i].freqChanged=false;
+
+      if (chan[i].killIt) {
+        if (i!=2) {
+          //rWrite(16+i*5+2,8);
+          int killDelta=chan[i].lastKill-chan[i].outVol+1;
+          if (killDelta<0) killDelta+=16;
+          chan[i].lastKill=chan[i].outVol;
+
+          if (killDelta!=1) {
+            rWrite(16+i*5+2,((chan[i].envVol<<4))|8);
+            for (int j=0; j<killDelta; j++) {
+              rWrite(16+i*5+2,0x09);
+              rWrite(16+i*5+2,0x11);
+              rWrite(16+i*5+2,0x08);
+            }
+          }
+        }
+        chan[i].killIt=false;
+      }
     }
   }
 }
@@ -300,6 +396,10 @@ 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].softEnv=ins->gb.softEnv;
       chan[c.chan].macroInit(ins);
       if (c.chan==2) {
         if (chan[c.chan].wave<0) {
@@ -308,23 +408,29 @@ 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].softEnv) {
         chan[c.chan].envVol=ins->gb.envVol;
         chan[c.chan].envLen=ins->gb.envLen;
         chan[c.chan].envDir=ins->gb.envDir;
         chan[c.chan].soundLen=ins->gb.soundLen;
       }
+      if (c.chan==2 && chan[c.chan].softEnv) {
+        chan[c.chan].soundLen=64;
+      }
       chan[c.chan].insChanged=false;
       break;
     }
     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) {
@@ -332,21 +438,32 @@ int DivPlatformGB::dispatch(DivCommand c) {
         chan[c.chan].insChanged=true;
         if (c.chan!=2) {
           DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_GB);
-          chan[c.chan].envVol=ins->gb.envVol;
-          chan[c.chan].envLen=ins->gb.envLen;
-          chan[c.chan].envDir=ins->gb.envDir;
-          chan[c.chan].soundLen=ins->gb.soundLen;
-          chan[c.chan].vol=chan[c.chan].envVol;
-          if (parent->song.gbInsAffectsEnvelope) {
-            rWrite(16+c.chan*5+2,((chan[c.chan].vol<<4))|(chan[c.chan].envLen&7)|((chan[c.chan].envDir&1)<<3));
+          if (!ins->gb.softEnv) {
+            chan[c.chan].envVol=ins->gb.envVol;
+            chan[c.chan].envLen=ins->gb.envLen;
+            chan[c.chan].envDir=ins->gb.envDir;
+            chan[c.chan].soundLen=ins->gb.soundLen;
+            chan[c.chan].vol=chan[c.chan].envVol;
+            chan[c.chan].outVol=chan[c.chan].vol;
+            if (parent->song.gbInsAffectsEnvelope) {
+              rWrite(16+c.chan*5+2,((chan[c.chan].vol<<4))|(chan[c.chan].envLen&7)|((chan[c.chan].envDir&1)<<3));
+            }
           }
         }
       }
       break;
     case DIV_CMD_VOLUME:
       chan[c.chan].vol=c.value;
+      chan[c.chan].outVol=c.value;
       if (c.chan==2) {
-        rWrite(16+c.chan*5+2,gbVolMap[chan[c.chan].vol]);
+        rWrite(16+c.chan*5+2,gbVolMap[chan[c.chan].outVol]);
+      }
+      if (!chan[c.chan].softEnv) {
+        chan[c.chan].envVol=chan[c.chan].vol;
+      } else if (c.chan!=2) {
+        chan[c.chan].envVol=chan[c.chan].vol;
+        if (!chan[c.chan].keyOn) chan[c.chan].killIt=true;
+        chan[c.chan].freqChanged=true;
       }
       break;
     case DIV_CMD_GET_VOLUME:
@@ -481,7 +598,7 @@ void DivPlatformGB::reset() {
   }
   memset(gb,0,sizeof(GB_gameboy_t));
   memset(regPool,0,128);
-  gb->model=GB_MODEL_DMG_B;
+  gb->model=model;
   GB_apu_init(gb);
   GB_set_sample_rate(gb,rate);
   // enable all channels
@@ -495,10 +612,18 @@ void DivPlatformGB::reset() {
   antiClickWavePos=0;
 }
 
+int DivPlatformGB::getPortaFloor(int ch) {
+  return 24;
+}
+
 bool DivPlatformGB::isStereo() {
   return true;
 }
 
+bool DivPlatformGB::getDCOffRequired() {
+  return (model==GB_MODEL_AGB);
+}
+
 void DivPlatformGB::notifyInsChange(int ins) {
   for (int i=0; i<4; i++) {
     if (chan[i].ins==ins) {
@@ -531,6 +656,20 @@ void DivPlatformGB::poke(std::vector<DivRegWrite>& wlist) {
 
 void DivPlatformGB::setFlags(unsigned int flags) {
   antiClickEnabled=!(flags&8);
+  switch (flags&3) {
+    case 0:
+      model=GB_MODEL_DMG_B;
+      break;
+    case 1:
+      model=GB_MODEL_CGB_C;
+      break;
+    case 2:
+      model=GB_MODEL_CGB_E;
+      break;
+    case 3:
+      model=GB_MODEL_AGB;
+      break;
+  }
 }
 
 int DivPlatformGB::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
@@ -544,6 +683,7 @@ int DivPlatformGB::init(DivEngine* p, int channels, int sugRate, unsigned int fl
   parent=p;
   dumpWrites=false;
   skipRegisterWrites=false;
+  model=GB_MODEL_DMG_B;
   gb=new GB_gameboy_t;
   setFlags(flags);
   reset();
diff --git a/src/engine/platform/gb.h b/src/engine/platform/gb.h
index 58cce8805..9498317bd 100644
--- a/src/engine/platform/gb.h
+++ b/src/engine/platform/gb.h
@@ -24,15 +24,17 @@
 #include "../macroInt.h"
 #include "../waveSynth.h"
 #include "sound/gb/gb.h"
+#include <queue>
 
 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;
-    signed char vol, outVol, wave;
+    bool active, insChanged, freqChanged, sweepChanged, keyOn, keyOff, inPorta, released, softEnv, killIt;
+    signed char vol, outVol, wave, lastKill;
     unsigned char envVol, envDir, envLen, soundLen;
-    unsigned short hwSeqPos, hwSeqDelay;
+    unsigned short hwSeqPos;
+    short hwSeqDelay;
     DivMacroInt std;
     void macroInit(DivInstrument* which) {
       std.init(which);
@@ -54,9 +56,13 @@ class DivPlatformGB: public DivDispatch {
       keyOn(false),
       keyOff(false),
       inPorta(false),
+      released(false),
+      softEnv(false),
+      killIt(false),
       vol(15),
       outVol(15),
       wave(-1),
+      lastKill(0),
       envVol(0),
       envDir(0),
       envLen(0),
@@ -70,10 +76,17 @@ class DivPlatformGB: public DivDispatch {
   bool antiClickEnabled;
   unsigned char lastPan;
   DivWaveSynth ws;
+  struct QueuedWrite {
+      unsigned char addr;
+      unsigned char val;
+      QueuedWrite(unsigned char a, unsigned char v): addr(a), val(v) {}
+  };
+  std::queue<QueuedWrite> writes;
 
   int antiClickPeriodCount, antiClickWavePos;
 
   GB_gameboy_t* gb;
+  GB_model_t model;
   unsigned char regPool[128];
   
   unsigned char procMute();
@@ -91,7 +104,9 @@ class DivPlatformGB: public DivDispatch {
     void forceIns();
     void tick(bool sysTick=true);
     void muteChannel(int ch, bool mute);
+    int getPortaFloor(int ch);
     bool isStereo();
+    bool getDCOffRequired();
     void notifyInsChange(int ins);
     void notifyWaveChange(int wave);
     void notifyInsDeletion(void* ins);
diff --git a/src/engine/platform/pce.cpp b/src/engine/platform/pce.cpp
index d71e19146..ee479f5b4 100644
--- a/src/engine/platform/pce.cpp
+++ b/src/engine/platform/pce.cpp
@@ -115,7 +115,7 @@ void DivPlatformPCE::acquire(short* bufL, short* bufR, size_t start, size_t len)
     pce->ResetTS(0);
 
     for (int i=0; i<6; i++) {
-      oscBuf[i]->data[oscBuf[i]->needle++]=(pce->channel[i].blip_prev_samp[0]+pce->channel[i].blip_prev_samp[1])<<1;
+      oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP((pce->channel[i].blip_prev_samp[0]+pce->channel[i].blip_prev_samp[1])<<1,-32768,32767);
     }
 
     tempL[0]=(tempL[0]>>1)+(tempL[0]>>2);
diff --git a/src/engine/platform/qsound.cpp b/src/engine/platform/qsound.cpp
index 04696f2cf..64daed60a 100644
--- a/src/engine/platform/qsound.cpp
+++ b/src/engine/platform/qsound.cpp
@@ -366,7 +366,7 @@ void DivPlatformQSound::tick(bool sysTick) {
         rWrite(q1_reg_map[Q1V_LOOP][i], qsound_loop);
         rWrite(q1_reg_map[Q1V_START][i], qsound_addr);
         rWrite(q1_reg_map[Q1V_PHASE][i], 0x8000);
-        //logV("ch %d bank=%04x, addr=%04x, end=%04x, loop=%04x!",i,qsound_bank,qsound_addr,qsound_end,qsound_loop);
+        logV("ch %d bank=%04x, addr=%04x, end=%04x, loop=%04x!",i,qsound_bank,qsound_addr,qsound_end,qsound_loop);
         // Write sample address. Enable volume
         if (!chan[i].std.vol.had) {
           rWrite(q1_reg_map[Q1V_VOL][i], chan[i].vol << 4);
diff --git a/src/engine/song.h b/src/engine/song.h
index 8375fc561..8b7eaa59f 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -562,7 +562,7 @@ struct DivSong {
     linearPitch(2),
     pitchSlideSpeed(4),
     loopModality(0),
-    properNoiseLayout(false),
+    properNoiseLayout(true),
     waveDutyIsVol(false),
     resetMacroOnPorta(false),
     legacyVolumeSlides(false),
diff --git a/src/gui/debug.cpp b/src/gui/debug.cpp
index f1c974e8b..5ae596bcd 100644
--- a/src/gui/debug.cpp
+++ b/src/gui/debug.cpp
@@ -334,7 +334,7 @@ void putDispatchChan(void* data, int chanNum, int type) {
       break;
     }
     default:
-      ImGui::Text("Unknown system! Help!");
+      ImGui::Text("Unimplemented chip! Help!");
       break;
   }
 }
diff --git a/src/gui/debugWindow.cpp b/src/gui/debugWindow.cpp
index 58dfac399..eec6fefb2 100644
--- a/src/gui/debugWindow.cpp
+++ b/src/gui/debugWindow.cpp
@@ -298,7 +298,7 @@ void FurnaceGUI::drawDebug() {
     }
     if (ImGui::TreeNode("Playground")) {
       if (pgSys<0 || pgSys>=e->song.systemLen) pgSys=0;
-      if (ImGui::BeginCombo("System",fmt::sprintf("%d. %s",pgSys+1,e->getSystemName(e->song.system[pgSys])).c_str())) {
+      if (ImGui::BeginCombo("Chip",fmt::sprintf("%d. %s",pgSys+1,e->getSystemName(e->song.system[pgSys])).c_str())) {
         for (int i=0; i<e->song.systemLen; i++) {
           if (ImGui::Selectable(fmt::sprintf("%d. %s",i+1,e->getSystemName(e->song.system[i])).c_str())) {
             pgSys=i;
@@ -359,7 +359,7 @@ void FurnaceGUI::drawDebug() {
       if (ImGui::TreeNode("Register Cheatsheet")) {
         const char** sheet=e->getRegisterSheet(pgSys);
         if (sheet==NULL) {
-          ImGui::Text("no cheatsheet available for this system.");
+          ImGui::Text("no cheatsheet available for this chip.");
         } else {
           if (ImGui::BeginTable("RegisterSheet",2,ImGuiTableFlags_SizingFixedSame)) {
             ImGui::TableNextRow();
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index c1cd7f076..8ee6c60b9 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1879,7 +1879,7 @@ void FurnaceGUI::processDrags(int dragX, int dragY) {
 #define sysAddOption(x) \
   if (ImGui::MenuItem(getSystemName(x))) { \
     if (!e->addSystem(x)) { \
-      showError("cannot add system! ("+e->getLastError()+")"); \
+      showError("cannot add chip! ("+e->getLastError()+")"); \
     } \
     updateWindowTitle(); \
   }
@@ -2887,7 +2887,7 @@ bool FurnaceGUI::loop() {
           if (ImGui::MenuItem("one file")) {
             openFileDialog(GUI_FILE_EXPORT_AUDIO_ONE);
           }
-          if (ImGui::MenuItem("multiple files (one per system)")) {
+          if (ImGui::MenuItem("multiple files (one per chip)")) {
             openFileDialog(GUI_FILE_EXPORT_AUDIO_PER_SYS);
           }
           if (ImGui::MenuItem("multiple files (one per channel)")) {
@@ -2928,7 +2928,7 @@ bool FurnaceGUI::loop() {
               "pattern indexes are ordered as they appear in the song."
             );
           }
-          ImGui::Text("systems to export:");
+          ImGui::Text("chips to export:");
           bool hasOneAtLeast=false;
           for (int i=0; i<e->song.systemLen; i++) {
             int minVersion=e->minVGMVersion(e->song.system[i]);
@@ -2937,17 +2937,17 @@ bool FurnaceGUI::loop() {
             ImGui::EndDisabled();
             if (minVersion>vgmExportVersion) {
               if (ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) {
-                ImGui::SetTooltip("this system is only available in VGM %d.%.2x and higher!",minVersion>>8,minVersion&0xff);
+                ImGui::SetTooltip("this chip is only available in VGM %d.%.2x and higher!",minVersion>>8,minVersion&0xff);
               }
             } else if (minVersion==0) {
               if (ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) {
-                ImGui::SetTooltip("this system is not supported by the VGM format!");
+                ImGui::SetTooltip("this chip is not supported by the VGM format!");
               }
             } else {
               if (willExport[i]) hasOneAtLeast=true;
             }
           }
-          ImGui::Text("select the systems you wish to export,");
+          ImGui::Text("select the chip you wish to export,");
           ImGui::Text("but only up to %d of each type.",(vgmExportVersion>=0x151)?2:1);
           if (hasOneAtLeast) {
             if (ImGui::MenuItem("click to export")) {
@@ -2972,14 +2972,14 @@ bool FurnaceGUI::loop() {
           ImGui::EndMenu();
         }
         ImGui::Separator();
-        if (ImGui::BeginMenu("add system...")) {
+        if (ImGui::BeginMenu("add chip...")) {
           for (int j=0; availableSystems[j]; j++) {
             if (!settings.hiddenSystems && (availableSystems[j]==DIV_SYSTEM_YMU759 || availableSystems[j]==DIV_SYSTEM_DUMMY)) continue;
             sysAddOption((DivSystem)availableSystems[j]);
           }
           ImGui::EndMenu();
         }
-        if (ImGui::BeginMenu("configure system...")) {
+        if (ImGui::BeginMenu("configure chip...")) {
           for (int i=0; i<e->song.systemLen; i++) {
             if (ImGui::TreeNode(fmt::sprintf("%d. %s##_SYSP%d",i+1,getSystemName(e->song.system[i]),i).c_str())) {
               drawSysConf(i,e->song.system[i],e->song.systemFlags[i],true);
@@ -2988,7 +2988,7 @@ bool FurnaceGUI::loop() {
           }
           ImGui::EndMenu();
         }
-        if (ImGui::BeginMenu("change system...")) {
+        if (ImGui::BeginMenu("change chip...")) {
           ImGui::Checkbox("Preserve channel positions",&preserveChanPos);
           for (int i=0; i<e->song.systemLen; i++) {
             if (ImGui::BeginMenu(fmt::sprintf("%d. %s##_SYSC%d",i+1,getSystemName(e->song.system[i]),i).c_str())) {
@@ -3001,12 +3001,12 @@ bool FurnaceGUI::loop() {
           }
           ImGui::EndMenu();
         }
-        if (ImGui::BeginMenu("remove system...")) {
+        if (ImGui::BeginMenu("remove chip...")) {
           ImGui::Checkbox("Preserve channel positions",&preserveChanPos);
           for (int i=0; i<e->song.systemLen; i++) {
             if (ImGui::MenuItem(fmt::sprintf("%d. %s##_SYSR%d",i+1,getSystemName(e->song.system[i]),i).c_str())) {
               if (!e->removeSystem(i,preserveChanPos)) {
-                showError("cannot remove system! ("+e->getLastError()+")");
+                showError("cannot remove chip! ("+e->getLastError()+")");
               }
             }
           }
diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index e0c18b6c1..0d90e3733 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
@@ -2989,15 +2993,18 @@ void FurnaceGUI::drawInsEdit() {
             ImGui::Text("Hardware Sequence");
             ImGui::EndMenuBar();
 
-            if (ins->gb.hwSeqLen>0) if (ImGui::BeginTable("HWSeqList",2)) {
+            if (ins->gb.hwSeqLen>0) if (ImGui::BeginTable("HWSeqList",3)) {
               ImGui::TableSetupColumn("c0",ImGuiTableColumnFlags_WidthFixed);
               ImGui::TableSetupColumn("c1",ImGuiTableColumnFlags_WidthStretch);
+              ImGui::TableSetupColumn("c2",ImGuiTableColumnFlags_WidthFixed);
               int curFrame=0;
               ImGui::TableNextRow(ImGuiTableRowFlags_Headers);
               ImGui::TableNextColumn();
               ImGui::Text("Tick");
               ImGui::TableNextColumn();
               ImGui::Text("Command");
+              ImGui::TableNextColumn();
+              ImGui::Text("Move/Remove");
               for (int i=0; i<ins->gb.hwSeqLen; i++) {
                 ImGui::TableNextRow();
                 ImGui::TableNextColumn();
@@ -3060,13 +3067,13 @@ 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;
                     }
 
@@ -3115,6 +3122,46 @@ void FurnaceGUI::drawInsEdit() {
                     break;
                 }
                 ImGui::PopID();
+                ImGui::TableNextColumn();
+                ImGui::PushID(i+512);
+                if (ImGui::Button(ICON_FA_CHEVRON_UP "##HWCmdUp")) {
+                  if (i>0) {
+                    e->lockEngine([ins,i]() {
+                      ins->gb.hwSeq[i-1].cmd^=ins->gb.hwSeq[i].cmd;
+                      ins->gb.hwSeq[i].cmd^=ins->gb.hwSeq[i-1].cmd;
+                      ins->gb.hwSeq[i-1].cmd^=ins->gb.hwSeq[i].cmd;
+
+                      ins->gb.hwSeq[i-1].data^=ins->gb.hwSeq[i].data;
+                      ins->gb.hwSeq[i].data^=ins->gb.hwSeq[i-1].data;
+                      ins->gb.hwSeq[i-1].data^=ins->gb.hwSeq[i].data;
+                    });
+                  }
+                  MARK_MODIFIED;
+                }
+                ImGui::SameLine();
+                if (ImGui::Button(ICON_FA_CHEVRON_DOWN "##HWCmdDown")) {
+                  if (i<ins->gb.hwSeqLen-1) {
+                    e->lockEngine([ins,i]() {
+                      ins->gb.hwSeq[i-1].cmd^=ins->gb.hwSeq[i].cmd;
+                      ins->gb.hwSeq[i].cmd^=ins->gb.hwSeq[i-1].cmd;
+                      ins->gb.hwSeq[i-1].cmd^=ins->gb.hwSeq[i].cmd;
+
+                      ins->gb.hwSeq[i-1].data^=ins->gb.hwSeq[i].data;
+                      ins->gb.hwSeq[i].data^=ins->gb.hwSeq[i-1].data;
+                      ins->gb.hwSeq[i-1].data^=ins->gb.hwSeq[i].data;
+                    });
+                  }
+                  MARK_MODIFIED;
+                }
+                ImGui::SameLine();
+                if (ImGui::Button(ICON_FA_TIMES "##HWCmdDel")) {
+                  for (int j=i; j<ins->gb.hwSeqLen-1; j++) {
+                    ins->gb.hwSeq[j].cmd=ins->gb.hwSeq[j+1].cmd;
+                    ins->gb.hwSeq[j].data=ins->gb.hwSeq[j+1].data;
+                  }
+                  ins->gb.hwSeqLen--;
+                }
+                ImGui::PopID();
               }
               ImGui::EndTable();
             }
@@ -3128,6 +3175,7 @@ void FurnaceGUI::drawInsEdit() {
             }
 
             ImGui::EndChild();
+            ImGui::EndDisabled();
           }
           ImGui::EndTabItem();
         }
@@ -3689,8 +3737,10 @@ 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;
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index 73e9d2333..37d4bfecf 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -468,7 +468,7 @@ void FurnaceGUI::drawSettings() {
           }
 
           bool restartOnFlagChangeB=settings.restartOnFlagChange;
-          if (ImGui::Checkbox("Restart song when changing system properties",&restartOnFlagChangeB)) {
+          if (ImGui::Checkbox("Restart song when changing chip properties",&restartOnFlagChangeB)) {
             settings.restartOnFlagChange=restartOnFlagChangeB;
           }
 
@@ -1232,11 +1232,6 @@ void FurnaceGUI::drawSettings() {
           }
           ImGui::EndDisabled();
 
-          bool chipNamesB=settings.chipNames;
-          if (ImGui::Checkbox("Use chip names instead of system names",&chipNamesB)) {
-            settings.chipNames=chipNamesB;
-          }
-
           bool oplStandardWaveNamesB=settings.oplStandardWaveNames;
           if (ImGui::Checkbox("Use standard OPL waveform names",&oplStandardWaveNamesB)) {
             settings.oplStandardWaveNames=oplStandardWaveNamesB;
@@ -1567,8 +1562,8 @@ void FurnaceGUI::drawSettings() {
               UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_SONG,"Song effect");
               UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_TIME,"Time effect");
               UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_SPEED,"Speed effect");
-              UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_SYS_PRIMARY,"Primary system effect");
-              UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_SYS_SECONDARY,"Secondary system effect");
+              UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_SYS_PRIMARY,"Primary specific effect");
+              UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_SYS_SECONDARY,"Secondary specific effect");
               UI_COLOR_CONFIG(GUI_COLOR_PATTERN_EFFECT_MISC,"Miscellaneous");
               UI_COLOR_CONFIG(GUI_COLOR_EE_VALUE,"External command output");
               ImGui::TreePop();
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 3259f00c0..484490348 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -185,6 +185,19 @@ void FurnaceGUI::drawSysConf(int chan, DivSystem type, unsigned int& flags, bool
       if (ImGui::Checkbox("Disable anti-click",&antiClick)) {
         copyOfFlags=(flags&(~8))|(antiClick<<3);
       }
+      ImGui::Text("Chip revision:");
+      if (ImGui::RadioButton("Original (DMG)",(flags&7)==0)) {
+        copyOfFlags=(flags&(~7))|0;
+      }
+      if (ImGui::RadioButton("Game Boy Color (rev C)",(flags&7)==1)) {
+        copyOfFlags=(flags&(~7))|1;
+      }
+      if (ImGui::RadioButton("Game Boy Color (rev E)",(flags&7)==2)) {
+        copyOfFlags=(flags&(~7))|2;
+      }
+      if (ImGui::RadioButton("Game Boy Advance",(flags&7)==3)) {
+        copyOfFlags=(flags&(~7))|3;
+      }
       break;
     }
     case DIV_SYSTEM_OPLL: