diff --git a/include/JSystem/JAudio/JASTrack.h b/include/JSystem/JAudio/JASTrack.h
index 08e5daef..076bbf59 100644
--- a/include/JSystem/JAudio/JASTrack.h
+++ b/include/JSystem/JAudio/JASTrack.h
@@ -96,7 +96,13 @@ namespace JASystem {
 
         class MoveParam_ {
         public:
-            MoveParam_();
+            MoveParam_()
+                : mCurrentValue(0.0f)
+                , mTargetValue(0.0f)
+                , mMoveTime(0.0f)
+                , mMoveAmount(0.0f)
+            {
+            }
 
             /* 0x00 */ f32 mCurrentValue;
             /* 0x04 */ f32 mTargetValue;
@@ -108,10 +114,21 @@ namespace JASystem {
         public:
             AInnerParam_();
 
-            /* 0x000 */ MoveParam_ mIIRs[4];
-            /* 0x010 */ f32 field_0x10[32];
-            /* 0x0C0 */ MoveParam_ field_0xc0[4];
-            /* 0x100 */ f32 field_0x100[8];
+            /* 0x000 */ MoveParam_ mVolume;
+            /* 0x010 */ MoveParam_ mPitch;
+            /* 0x020 */ MoveParam_ mFxmix;
+            /* 0x030 */ MoveParam_ mPan;
+            /* 0x040 */ MoveParam_ mDolby;
+            /* 0x050 */ MoveParam_ _50;
+            /* 0x060 */ MoveParam_ mOsc0Width;
+            /* 0x070 */ MoveParam_ mOsc0Rate;
+            /* 0x080 */ MoveParam_ mOsc0Vertex;
+            /* 0x090 */ MoveParam_ mOsc1Width;
+            /* 0x0A0 */ MoveParam_ mOsc1Rate;
+            /* 0x0B0 */ MoveParam_ mOsc1Vertex;
+            /* 0x0C0 */ MoveParam_ mIIRs[4];
+            /* 0x100 */ MoveParam_ _100;
+            /* 0x110 */ MoveParam_ _110;
         };
 
         class TimedParam_ {
diff --git a/src/JSystem/JAudio/JASSeqParser.cpp b/src/JSystem/JAudio/JASSeqParser.cpp
index e7fe2c97..943de525 100644
--- a/src/JSystem/JAudio/JASSeqParser.cpp
+++ b/src/JSystem/JAudio/JASSeqParser.cpp
@@ -581,25 +581,32 @@ int JASystem::TSeqParser::cmdVibPitch(TTrack* track, u32* args) {
 
 /* 8027F544-8027F5C8       .text cmdIIRSet__Q28JASystem10TSeqParserFPQ28JASystem6TTrackPUl */
 int JASystem::TSeqParser::cmdIIRSet(TTrack* track, u32* args) {
-    /* Nonmatching */
-    for (int i = 0; i < 4; i++) {
-        track->mTimedParam.mInnerParam.mIIRs[i].mTargetValue = (s16)args[i] / 32768.0f;
-        track->mTimedParam.mInnerParam.mIIRs[i].mCurrentValue = track->mTimedParam.mInnerParam.mIIRs[i].mTargetValue;
-        track->mTimedParam.mInnerParam.mIIRs[i].mMoveAmount = 0.0f;
-        track->mTimedParam.mInnerParam.mIIRs[i].mMoveTime = 1.0f;
+    for (u8 i = 0; i < 4; i++) {
+        // TTrack::MoveParam_* iir = &track->mTimedParam.mInnerParam.mIIRs[i];
+        // Fakematch? Accessing mIIRs directly results in fewer instructions than indexing into
+        // mVolume as if it was an array.
+        TTrack::MoveParam_* iir = (&track->mTimedParam.mInnerParam.mVolume) + (u8)(i + 0xC);
+        iir->mTargetValue = (s16)args[i] / 32768.0f;
+        iir->mCurrentValue = iir->mTargetValue;
+        iir->mMoveAmount = 0.0f;
+        iir->mMoveTime = 1.0f;
     }
     return 0;
 }
 
 /* 8027F5C8-8027F65C       .text cmdIIRCutOff__Q28JASystem10TSeqParserFPQ28JASystem6TTrackPUl */
 int JASystem::TSeqParser::cmdIIRCutOff(TTrack* track, u32* args) {
-    /* Nonmatching */
-    s16* table = &JASystem::Player::CUTOFF_TO_IIR_TABLE[u8(args[0]) * 4];
-    for (int i = 0; i < 4; i++) {
-        track->mTimedParam.mInnerParam.mIIRs[i].mTargetValue = table[i] / (32768.0f - 1.0f);
-        track->mTimedParam.mInnerParam.mIIRs[i].mCurrentValue = track->mTimedParam.mInnerParam.mIIRs[i].mTargetValue;
-        track->mTimedParam.mInnerParam.mIIRs[i].mMoveAmount = 0.0f;
-        track->mTimedParam.mInnerParam.mIIRs[i].mMoveTime = 1.0f;
+    u8 iirTableIdx = args[0];
+    for (u8 i = 0; i < 4; i++) {
+        s16* table = &JASystem::Player::CUTOFF_TO_IIR_TABLE[iirTableIdx * 4];
+        // TTrack::MoveParam_* iir = &track->mTimedParam.mInnerParam.mIIRs[i];
+        // Fakematch? Accessing mIIRs directly results in fewer instructions than indexing into
+        // mVolume as if it was an array.
+        TTrack::MoveParam_* iir = (&track->mTimedParam.mInnerParam.mVolume) + (u8)(i + 0xC);
+        iir->mTargetValue = table[i] / (32768.0f - 1.0f);
+        iir->mCurrentValue = iir->mTargetValue;
+        iir->mMoveAmount = 0.0f;
+        iir->mMoveTime = 1.0f;
     }
     return 0;
 }
diff --git a/src/JSystem/JAudio/JASTrack.cpp b/src/JSystem/JAudio/JASTrack.cpp
index 78b323b8..4b65d6e5 100644
--- a/src/JSystem/JAudio/JASTrack.cpp
+++ b/src/JSystem/JAudio/JASTrack.cpp
@@ -724,16 +724,22 @@ f32 JASystem::TVibrate::getValue() const {
     /* Nonmatching */
 }
 
-/* 80283FD0-80283FE8       .text __ct__Q38JASystem6TTrack10MoveParam_Fv */
-JASystem::TTrack::MoveParam_::MoveParam_() {
-    /* Nonmatching */
-    mCurrentValue = 0.0f;
-    mTargetValue = 0.0f;
-    mMoveTime = 0.0f;
-    mMoveAmount = 0.0f;
-}
-
 /* 80283FE8-80284118       .text __ct__Q38JASystem6TTrack12AInnerParam_Fv */
-JASystem::TTrack::AInnerParam_::AInnerParam_() {
-    /* Nonmatching */
+JASystem::TTrack::AInnerParam_::AInnerParam_()
+    : mVolume()
+    , mPitch()
+    , mFxmix()
+    , mPan()
+    , mDolby()
+    , _50()
+    , mOsc0Width()
+    , mOsc0Rate()
+    , mOsc0Vertex()
+    , mOsc1Width()
+    , mOsc1Rate()
+    , mOsc1Vertex()
+    , mIIRs()
+    , _100()
+    , _110()
+{
 }