diff --git a/configure.py b/configure.py
index af7f79487..d836ff2f7 100644
--- a/configure.py
+++ b/configure.py
@@ -685,7 +685,7 @@ config.libs = [
             Object(Matching,    "JSystem/JAudio/JASSimpleWaveBank.cpp"),
             Object(Matching,    "JSystem/JAudio/JASInstEffect.cpp"),
             Object(NonMatching, "JSystem/JAudio/JASInstSense.cpp"),
-            Object(NonMatching, "JSystem/JAudio/JASInstRand.cpp"),
+            Object(Matching,    "JSystem/JAudio/JASInstRand.cpp"),
             Object(NonMatching, "JSystem/JAudio/JASWSParser.cpp"),
             Object(NonMatching, "JSystem/JAudio/JASBNKParser.cpp"),
             Object(Matching,    "JSystem/JAudio/JASWaveArcLoader.cpp"),
diff --git a/include/JSystem/JAudio/JASInstRand.h b/include/JSystem/JAudio/JASInstRand.h
new file mode 100644
index 000000000..e83c3f537
--- /dev/null
+++ b/include/JSystem/JAudio/JASInstRand.h
@@ -0,0 +1,20 @@
+#ifndef JASINSTRAND_H
+#define JASINSTRAND_H
+
+#include "JSystem/JAudio/JASInstEffect.h"
+
+namespace JASystem {
+    class TInstRand : public TInstEffect {
+    public:
+        TInstRand() {
+            field_0x8 = 1.0f;
+            field_0xc = 0.0f;
+        }
+        virtual f32 getY(int, int) const;
+
+        /* 0x08 */ f32 field_0x8;
+        /* 0x0C */ f32 field_0xc;
+    };
+}
+
+#endif /* JASINSTRAND_H */
diff --git a/src/JSystem/JAudio/JASInstRand.cpp b/src/JSystem/JAudio/JASInstRand.cpp
index ce302d8a6..ec0df58c6 100644
--- a/src/JSystem/JAudio/JASInstRand.cpp
+++ b/src/JSystem/JAudio/JASInstRand.cpp
@@ -3,11 +3,13 @@
 // Translation Unit: JASInstRand.cpp
 //
 
-#include "JASInstRand.h"
-#include "dolphin/types.h"
+#include "JSystem/JAudio/JASInstRand.h"
+#include "JSystem/JMath/random.h"
 
 /* 80286B58-80286BF4       .text getY__Q28JASystem9TInstRandCFii */
-void JASystem::TInstRand::getY(int, int) const {
-    /* Nonmatching */
+f32 JASystem::TInstRand::getY(int, int) const {
+    static JMath::TRandom_fast_ oRandom(0);
+    f32 tmp = (oRandom.get_ufloat_1() * 2.0f - 0.9999999f);
+    tmp *= field_0xc;
+    return tmp + field_0x8;
 }
-