diff --git a/papers/newIns.md b/papers/newIns.md
index e5eee2d14..2533a2b6c 100644
--- a/papers/newIns.md
+++ b/papers/newIns.md
@@ -126,6 +126,10 @@ the following instrument types are available:
 - 57: PowerNoise (slope)
 - 58: Dave
 - 59: NDS
+- 60: GBA DMA
+- 61: GBA MinMod
+- 62: Bifurcator
+- 63: SID2
 
 the following feature codes are recognized:
 
@@ -153,6 +157,7 @@ the following feature codes are recognized:
 - `NE`: NES DPCM sample map data
 - `EF`: ESFM ins data
 - `PN`: PowerNoise ins data
+- `S2`: SID2 ins data
 - `EN`: end of features
   - if you find this feature code, stop reading the instrument.
   - it will usually appear only when there sample/wave lists.
@@ -669,3 +674,14 @@ size | description
 -----|------------------------------------
   1  | octave
 ```
+
+# SID2 data (S2)
+
+```
+size | description
+-----|------------------------------------
+  1  | parameters
+     | - bit 6-7: noise mode
+     | - bit 4-5: wave mix mode
+     | - bit 0-3: volume
+```
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 14bfd0db2..ed2512b49 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -54,8 +54,8 @@ class DivWorkPool;
 
 #define DIV_UNSTABLE
 
-#define DIV_VERSION "dev197"
-#define DIV_ENGINE_VERSION 197
+#define DIV_VERSION "dev198"
+#define DIV_ENGINE_VERSION 198
 // 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 d086f2287..96d5492d1 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -841,35 +841,7 @@ void DivInstrument::writeFeaturePN(SafeWriter* w) {
 void DivInstrument::writeFeatureS2(SafeWriter* w) {
   FEATURE_BEGIN("S2");
 
-  // this is for compatibility.
-  w->writeC(
-    (c64.dutyIsAbs?0x80:0)|
-    (c64.initFilter?0x40:0)|
-    (c64.toFilter?0x10:0)|
-    (c64.noiseOn?8:0)|
-    (c64.pulseOn?4:0)|
-    (c64.sawOn?2:0)|
-    (c64.triOn?1:0)
-  );
-
-  w->writeC(
-    (c64.oscSync?0x80:0)|
-    (c64.ringMod?0x40:0)|
-    (c64.noTest?0x20:0)|
-    (c64.filterIsAbs?0x10:0)|
-    (c64.ch3off?8:0)|
-    (c64.bp?4:0)|
-    (c64.hp?2:0)|
-    (c64.lp?1:0)
-  );
-
-  w->writeC(((c64.a&15)<<4)|(c64.d&15));
-  w->writeC(((c64.s&15)<<4)|(c64.r&15));
-  w->writeS(c64.duty);
-  w->writeS(c64.cut&4095);
-  w->writeC(c64.res);
-
-  w->writeC(sid2.volume|(sid2.mixMode<<4)|(sid2.noiseMode<<6));
+  w->writeC((sid2.volume&15)|((sid2.mixMode&3)<<4)|((sid2.noiseMode&3)<<6));
 
   FEATURE_END;
 }
@@ -2185,16 +2157,6 @@ void DivInstrument::readFeaturePN(SafeReader& reader, short version) {
 void DivInstrument::readFeatureS2(SafeReader& reader, short version) {
   READ_FEAT_BEGIN;
 
-  // these are reserved.
-  reader.readC();
-  reader.readC();
-  reader.readC();
-  reader.readC();
-  reader.readS();
-
-  reader.readS();
-  reader.readC();
-
   unsigned char next=reader.readC();
 
   sid2.volume=next&0xf;