diff --git a/3rdparty/soundtouch/CMakeLists.txt b/3rdparty/soundtouch/CMakeLists.txt
index 5edcf65e2e..0c90e46496 100644
--- a/3rdparty/soundtouch/CMakeLists.txt
+++ b/3rdparty/soundtouch/CMakeLists.txt
@@ -1,5 +1,4 @@
 add_library(pcsx2-soundtouch
-	source/SoundStretch/WavFile.cpp
 	source/SoundTouch/AAFilter.cpp
 	source/SoundTouch/BPMDetect.cpp
 	source/SoundTouch/cpu_detect_x86.cpp
@@ -19,7 +18,6 @@ add_library(pcsx2-soundtouch
 	soundtouch/FIFOSamplePipe.h
 	soundtouch/SoundTouch.h
 	soundtouch/STTypes.h
-	source/SoundStretch/WavFile.h
 	source/SoundTouch/AAFilter.h
 	source/SoundTouch/cpu_detect.h
 	source/SoundTouch/FIRFilter.h
diff --git a/3rdparty/soundtouch/source/SoundTouch/InterpolateCubic.h b/3rdparty/soundtouch/source/SoundTouch/InterpolateCubic.h
index d7e9db6498..0d4ea6c51e 100644
--- a/3rdparty/soundtouch/source/SoundTouch/InterpolateCubic.h
+++ b/3rdparty/soundtouch/source/SoundTouch/InterpolateCubic.h
@@ -38,7 +38,7 @@
 namespace soundtouch
 {
 
-class InterpolateCubic : public TransposerBase
+class InterpolateCubic final : public TransposerBase
 {
 protected:
     virtual int transposeMono(SAMPLETYPE *dest, 
@@ -58,7 +58,7 @@ public:
 
     virtual void resetRegisters() override;
 
-    int getLatency() const
+    int getLatency() const override
     {
         return 1;
     }
diff --git a/3rdparty/soundtouch/source/SoundTouch/InterpolateLinear.h b/3rdparty/soundtouch/source/SoundTouch/InterpolateLinear.h
index c1aa8782f8..e43fda9321 100644
--- a/3rdparty/soundtouch/source/SoundTouch/InterpolateLinear.h
+++ b/3rdparty/soundtouch/source/SoundTouch/InterpolateLinear.h
@@ -39,7 +39,7 @@ namespace soundtouch
 {
 
 /// Linear transposer class that uses integer arithmetic
-class InterpolateLinearInteger : public TransposerBase
+class InterpolateLinearInteger final : public TransposerBase
 {
 protected:
     int iFract;
@@ -69,23 +69,23 @@ public:
 
 
 /// Linear transposer class that uses floating point arithmetic
-class InterpolateLinearFloat : public TransposerBase
+class InterpolateLinearFloat final : public TransposerBase
 {
 protected:
     double fract;
 
     virtual int transposeMono(SAMPLETYPE *dest, 
                        const SAMPLETYPE *src, 
-                       int &srcSamples);
+                       int &srcSamples) override;
     virtual int transposeStereo(SAMPLETYPE *dest, 
                          const SAMPLETYPE *src, 
-                         int &srcSamples);
-    virtual int transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, int &srcSamples);
+                         int &srcSamples) override;
+    virtual int transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, int &srcSamples) override;
 
 public:
     InterpolateLinearFloat();
 
-    virtual void resetRegisters();
+    void resetRegisters() override;
 
     int getLatency() const override
     {
diff --git a/3rdparty/soundtouch/source/SoundTouch/InterpolateShannon.h b/3rdparty/soundtouch/source/SoundTouch/InterpolateShannon.h
index 332059df42..40265db014 100644
--- a/3rdparty/soundtouch/source/SoundTouch/InterpolateShannon.h
+++ b/3rdparty/soundtouch/source/SoundTouch/InterpolateShannon.h
@@ -43,7 +43,7 @@
 namespace soundtouch
 {
 
-class InterpolateShannon : public TransposerBase
+class InterpolateShannon final : public TransposerBase
 {
 protected:
     int transposeMono(SAMPLETYPE *dest, 
@@ -63,7 +63,7 @@ public:
 
     void resetRegisters() override;
 
-    int getLatency() const
+    int getLatency() const override
     {
         return 3;
     }