weird bugged float harp mgr functions

config/SOUE01/symbols.txt

@@ -20913,8 +20913,8 @@ fn_803814B0 = .text:0x803814B0; // type:function size:0x8C
 fn_80381540 = .text:0x80381540; // type:function size:0x1C
 fn_80381560 = .text:0x80381560; // type:function size:0x14
 fn_80381580 = .text:0x80381580; // type:function size:0x78
-fn_80381600 = .text:0x80381600; // type:function size:0xA0
-fn_803816A0 = .text:0x803816A0; // type:function size:0xC0
+shiftFloat1__17dSndHarpSongMgr_cFf = .text:0x80381600; // type:function size:0xA0
+shiftFloat2__17dSndHarpSongMgr_cFf = .text:0x803816A0; // type:function size:0xC0
 resetFloatArr1__17dSndHarpSongMgr_cFv = .text:0x80381760; // type:function size:0x60
 resetFloatArr2__17dSndHarpSongMgr_cFv = .text:0x803817C0; // type:function size:0x80
 fn_80381840 = .text:0x80381840; // type:function size:0x28

include/d/snd/d_snd_harp_song_mgr.h

@@ -24,7 +24,8 @@ public:
     }
 
 private:
-
+    void shiftFloat1(f32 val);
+    void shiftFloat2(f32 val);
     void resetFloatArr1();
     void resetFloatArr2();
 

src/d/snd/d_snd_harp_song_mgr.cpp

@@ -73,6 +73,42 @@ void dSndHarpSongMgr_c::setupState0() {
     mDataLoaded = true;
 }
 
+void dSndHarpSongMgr_c::shiftFloat1(f32 val) {
+    if (val < 0.0f) {
+        val = 0.0f;
+    }
+    if (val > 150.0f) {
+        val = 150.0f;
+    }
+
+    // @bug (?) this loop ends up copying the value of field_0x07C[0]
+    // to all array elements when surely the intention was to
+    // move each of them back by one position. TODO: are array entries
+    // other than [0] read anywhere?
+    for (int i = 1; i < 300; i++) {
+        field_0x07C[i] = field_0x07C[i - 1];
+    }
+    field_0x07C[0] = val;
+}
+
+void dSndHarpSongMgr_c::shiftFloat2(f32 val) {
+    if (val < 0.0f) {
+        val = 0.0f;
+    }
+    if (val > 240.0f) {
+        val = 240.0f;
+    }
+
+    // @bug (?) this loop ends up copying the value of field_0x52C[0]
+    // to all array elements when surely the intention was to
+    // move each of them back by one position. TODO: are array entries
+    // other than [0] read anywhere?
+    for (int i = 1; i < 30; i++) {
+        field_0x52C[i] = field_0x52C[i - 1];
+    }
+    field_0x52C[0] = val;
+}
+
 void dSndHarpSongMgr_c::resetFloatArr1() {
     for (int i = 0; i < 300; i++) {
         field_0x07C[i] = 0.0f;