I can't believe this function matches

include/d/snd/d_snd_bgm_harp_data.h

@@ -2,6 +2,7 @@
 #define D_SND_BGM_HARP_DATA_H
 
 #include "common.h"
+#include "d/snd/d_snd_rng_mgr.h"
 
 /**
  * This file deals with the pitch of the Goddess' Harp when Link
@@ -37,6 +38,10 @@ struct dSndBgmDataHarpVar_c {
         field_0x00 |= 1;
     }
 
+    bool checkFlag() const {
+        return field_0x00 & 1;
+    }
+
     /* 0x00 */ u8 field_0x00; // flags
     /* 0x01 */ s8 field_0x01; // var
 };
@@ -61,7 +66,7 @@ public:
         mPosition = position;
     }
 
-    s32 getCount() const {
+    s32 getCount() {
         return mCount;
     }
 
@@ -69,6 +74,16 @@ public:
         return mMax;
     }
 
+    s32 getNumBitsSet() {
+        s32 numBits = 0;
+        for (int i = 0; i < getCount(); i++) {
+            if (mpVars[i].checkFlag()) {
+                numBits++;
+            }
+        }
+        return numBits;
+    }
+
     dSndBgmDataHarpVar_c *getVar(s32 idx) {
         if (idx >= getCount()) {
             return nullptr;
@@ -76,6 +91,33 @@ public:
         return &mpVars[idx];
     }
 
+    s32 getRandomIdx() {
+        return dSndRngMgr_c::GetInstance()->rndIntRange(0, getCount());
+    }
+
+    s32 getRandomIdxWithBitSet() {
+        s32 numBitsSet = getNumBitsSet();
+        s32 idx;
+        if (numBitsSet <= 0) {
+            return 0;
+        } else {
+            idx = dSndRngMgr_c::GetInstance()->rndIntRange(0, getCount());
+            while (true) {
+                if (mpVars[idx].checkFlag()) {
+                    return idx;
+                }
+                idx = dSndRngMgr_c::GetInstance()->rndIntRange(0, getCount());
+            }
+        }
+    }
+
+    s32 getVal(s32 idx) {
+        if (idx >= getCount()) {
+            return 0;
+        }
+        return mpVars[idx].field_0x01;
+    }
+
     dSndBgmDataHarpVar_c *getUnusedVar() {
         if (mCount >= mMax) {
             return nullptr;

include/d/snd/d_snd_bgm_sound.h

@@ -55,7 +55,7 @@ public:
     void onBecomeActive();
     bool isBgmBattle() const;
 
-    const dSndBgmDataHarpVarSetBase_c *getCurrentHarpVarSet();
+    dSndBgmDataHarpVarSetBase_c *getCurrentHarpVarSet();
 
     u32 getStrmPlaySamplePosition();
     u32 getWavePlaySamplePosition();

include/d/snd/d_snd_bgm_sound_harp_mgr.h

@@ -15,7 +15,7 @@ public:
 
     void setPlaySamplePosition(s32 position);
 
-    const dSndBgmDataHarpVarSetBase_c *getCurrentVarSet();
+    dSndBgmDataHarpVarSetBase_c *getCurrentVarSet();
 
     bool isLoaded() const {
         return mIsLoaded;

include/d/snd/d_snd_rng_mgr.h

@@ -10,10 +10,9 @@ class dSndRngMgr_c : public dSndRng_c {
 public:
     SND_DISPOSER_MEMBERS(dSndRngMgr_c)
 
-    u32 rndIntRange(s32 min, s32 max);
-
 public:
     dSndRngMgr_c() {}
+    u32 rndIntRange(s32 min, s32 max);
 };
 
 #endif

include/d/snd/d_snd_small_effect_mgr.h

@@ -82,6 +82,8 @@ private:
     bool isPlayingSound(u32 playerIdx, u32 soundId);
     bool isPlayingSound(u32 soundId);
 
+    void setBitsIfAdjacent(dSndBgmDataHarpVarSetBase_c *set, s32 count, s32 target, u32 *pMask);
+
     /**
      * Finds a sound handle currently playing the given sound,
      * or an idle sound handle,
@@ -100,9 +102,9 @@ private:
     /* 0x30 */ s32 mDelayedSoundTimers[NUM_DELAYED_SOUNDS];
     /* 0x38 */ u32 mTextboxAdvanceSound;
     /* 0x3C */ nw4r::snd::SoundHandle mBattleTuttiHandle;
-    /* 0x40 */ u16 field_0x40;
-    /* 0x42 */ u16 field_0x42;
-    /* 0x44 */ s32 field_0x44;
+    /* 0x40 */ s16 field_0x40;
+    /* 0x42 */ s16 field_0x42;
+    /* 0x44 */ u32 field_0x44;
 };
 
 #endif

include/d/snd/d_snd_types.h

@@ -28,6 +28,8 @@ class dSndBgmSoundHarpMgr_c;
 class dSndBgmSeqConfig;
 class dSndBgmBattleConfig;
 
+class dSndBgmDataHarpVarSetBase_c;
+
 class dSndHarpSongData_c;
 class dSndTagData;