diff --git a/data/file_list.yml b/data/file_list.yml
index 849ee8c91c..d6dfe85b9e 100644
--- a/data/file_list.yml
+++ b/data/file_list.yml
@@ -280404,19 +280404,19 @@ Library/Se/Project/SePlayParam.o:
     label:
     - _ZN2al11SePlayParamC1Ev
     - _ZN2al11SePlayParamC2Ev
-    status: NotDecompiled
+    status: Matching
   - offset: 0x9e8fb0
     size: 16
     label: _ZN2al11SePlayParam5resetEv
-    status: NotDecompiled
+    status: Matching
   - offset: 0x9e8fc0
     size: 16
     label: _ZN2al11SePlayParam3setENS_15SePlayParamTypeEff
-    status: NotDecompiled
+    status: Matching
   - offset: 0x9e8fd0
     size: 24
     label: _ZN2al11SePlayParam6setMulENS_15SePlayParamTypeEff
-    status: NotDecompiled
+    status: Matching
 Library/Se/Project/SePlayParamList.o:
   '.text':
   - offset: 0x9e8fe8
diff --git a/lib/al/Library/Se/Project/SePlayParam.cpp b/lib/al/Library/Se/Project/SePlayParam.cpp
new file mode 100644
index 0000000000..d26d6f846c
--- /dev/null
+++ b/lib/al/Library/Se/Project/SePlayParam.cpp
@@ -0,0 +1,28 @@
+#include "Library/Se/Project/SePlayParam.h"
+
+namespace al {
+
+SePlayParam::SePlayParam() {
+    reset();
+}
+
+void SePlayParam::reset() {
+    mType = SePlayParamType::Invalid;
+    mValue = 1.0f;
+    mValue2 = 0.0f;
+}
+
+void SePlayParam::set(SePlayParamType type, f32 value, f32 value2) {
+    mType = type;
+    mValue = value;
+    mValue2 = value2;
+}
+
+void SePlayParam::setMul(SePlayParamType type, f32 value, f32 value2) {
+    f32 mul = mValue * value;
+    mType = type;
+    mValue2 = value2;
+    mValue = mul;
+}
+
+}  // namespace al
diff --git a/lib/al/Library/Se/Project/SePlayParam.h b/lib/al/Library/Se/Project/SePlayParam.h
new file mode 100644
index 0000000000..fd564de7ab
--- /dev/null
+++ b/lib/al/Library/Se/Project/SePlayParam.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <basis/seadTypes.h>
+
+namespace al {
+
+enum class SePlayParamType {
+    Invalid,
+    Volume,
+    Pitch,
+    SeqTempoRatio,
+    EffectSend,
+    SeqLocalVariable,
+    SeqGlobalVariable,
+    LpfFreq,
+    BiquadFilter,
+};
+
+class SePlayParam {
+public:
+    SePlayParam();
+
+    void reset();
+    void set(SePlayParamType type, f32 value, f32 value2);
+    void setMul(SePlayParamType type, f32 value, f32 value2);
+
+private:
+    SePlayParamType mType;
+    f32 mValue;
+    f32 mValue2;
+};
+
+static_assert(sizeof(SePlayParam) == 0xC);
+
+}  // namespace al