diff --git a/papers/newIns.md b/papers/newIns.md
index f37a54deb..e5eee2d14 100644
--- a/papers/newIns.md
+++ b/papers/newIns.md
@@ -361,6 +361,7 @@ size | description
   1  | sound length
      | - 64 is infinity
   1  | flags
+     | - bit 2: double wave width for GBA (>=196)
      | - bit 1: always init envelope
      | - bit 0: software envelope (zombie mode)
   1  | hardware sequence length
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 601d750e4..d224cfd65 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -54,8 +54,8 @@ class DivWorkPool;
 
 #define DIV_UNSTABLE
 
-#define DIV_VERSION "dev195"
-#define DIV_ENGINE_VERSION 195
+#define DIV_VERSION "dev196"
+#define DIV_ENGINE_VERSION 196
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index eddeeb807..6225765aa 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -83,7 +83,8 @@ bool DivInstrumentGB::operator==(const DivInstrumentGB& other) {
     _C(soundLen) &&
     _C(hwSeqLen) &&
     _C(softEnv) &&
-    _C(alwaysInit)
+    _C(alwaysInit) &&
+    _C(doubleWave)
   );
 }
 
@@ -484,6 +485,7 @@ void DivInstrument::writeFeatureGB(SafeWriter* w) {
   w->writeC(gb.soundLen);
 
   w->writeC(
+    (gb.doubleWave?4:0)|
     (gb.alwaysInit?2:0)|
     (gb.softEnv?1:0)
   );
@@ -1633,6 +1635,7 @@ void DivInstrument::readFeatureGB(SafeReader& reader, short version) {
   gb.soundLen=reader.readC();
 
   next=reader.readC();
+  if (version>=196) gb.doubleWave=next&4;
   gb.alwaysInit=next&2;
   gb.softEnv=next&1;
 
diff --git a/src/engine/instrument.h b/src/engine/instrument.h
index 45b02c727..21de82121 100644
--- a/src/engine/instrument.h
+++ b/src/engine/instrument.h
@@ -384,7 +384,7 @@ struct DivInstrumentSTD {
 
 struct DivInstrumentGB {
   unsigned char envVol, envDir, envLen, soundLen, hwSeqLen;
-  bool softEnv, alwaysInit, doubleWave; // TODO file save/load of doubleWave
+  bool softEnv, alwaysInit, doubleWave;
   enum HWSeqCommands: unsigned char {
     DIV_GB_HWCMD_ENVELOPE=0,
     DIV_GB_HWCMD_SWEEP,