diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f94e3b..caa04d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@ if(MSVC)
   set(COMPILE_DEFINITIONS /O2 /fp:fast)
   set(COMPILE_OPTIONS )
 else()
-  set(COMPILE_OPTIONS -Ofast -Wall -Wno-unknown-pragmas)
+  set(COMPILE_OPTIONS -Ofast -Wall -Wextra -Wno-unknown-pragmas)
 endif()
 
 #####################
diff --git a/source/SoundStretch/WavFile.cpp b/source/SoundStretch/WavFile.cpp
index 539edd2..52efb1d 100644
--- a/source/SoundStretch/WavFile.cpp
+++ b/source/SoundStretch/WavFile.cpp
@@ -123,7 +123,7 @@ static const char dataStr[] = "data";
     }
 
     // dummy helper-function
-    static inline void _swap16Buffer(short *pData, int numBytes)
+    static inline void _swap16Buffer(short *, int)
     {
         // do nothing
     }
diff --git a/source/SoundStretch/WavFile.h b/source/SoundStretch/WavFile.h
index b0f4d96..61a174e 100644
--- a/source/SoundStretch/WavFile.h
+++ b/source/SoundStretch/WavFile.h
@@ -118,9 +118,6 @@ private:
     /// File pointer.
     FILE *fptr;
 
-    /// Position within the audio stream
-    long position;
-
     /// Counter of how many bytes of sample data have been read from the file.
     long dataRead;
 
diff --git a/source/SoundTouch/FIRFilter.cpp b/source/SoundTouch/FIRFilter.cpp
index 478b3b6..edfeb41 100644
--- a/source/SoundTouch/FIRFilter.cpp
+++ b/source/SoundTouch/FIRFilter.cpp
@@ -273,7 +273,7 @@ uint FIRFilter::evaluate(SAMPLETYPE *dest, const SAMPLETYPE *src, uint numSample
 
 // Operator 'new' is overloaded so that it automatically creates a suitable instance 
 // depending on if we've a MMX-capable CPU available or not.
-void * FIRFilter::operator new(size_t s)
+void * FIRFilter::operator new(size_t)
 {
     // Notice! don't use "new FIRFilter" directly, use "newInstance" to create a new instance instead!
     ST_THROW_RT_ERROR("Error in FIRFilter::new: Don't use 'new FIRFilter', use 'newInstance' member instead!");
diff --git a/source/SoundTouch/InterpolateCubic.h b/source/SoundTouch/InterpolateCubic.h
index 251c23f..64faf64 100644
--- a/source/SoundTouch/InterpolateCubic.h
+++ b/source/SoundTouch/InterpolateCubic.h
@@ -58,7 +58,7 @@ public:
 
     virtual void resetRegisters() override;
 
-    int getLatency() const
+    virtual int getLatency() const override
     {
         return 1;
     }
diff --git a/source/SoundTouch/InterpolateLinear.h b/source/SoundTouch/InterpolateLinear.h
index 6104fae..8034d76 100644
--- a/source/SoundTouch/InterpolateLinear.h
+++ b/source/SoundTouch/InterpolateLinear.h
@@ -61,7 +61,7 @@ public:
 
     virtual void resetRegisters() override;
 
-    int getLatency() const
+    virtual int getLatency() const override
     {
         return 0;
     }
diff --git a/source/SoundTouch/InterpolateShannon.cpp b/source/SoundTouch/InterpolateShannon.cpp
index 1d69a2e..8d97613 100644
--- a/source/SoundTouch/InterpolateShannon.cpp
+++ b/source/SoundTouch/InterpolateShannon.cpp
@@ -171,9 +171,9 @@ int InterpolateShannon::transposeStereo(SAMPLETYPE *pdest,
 
 /// Transpose stereo audio. Returns number of produced output samples, and 
 /// updates "srcSamples" to amount of consumed source samples
-int InterpolateShannon::transposeMulti(SAMPLETYPE *pdest, 
-                    const SAMPLETYPE *psrc, 
-                    int &srcSamples)
+int InterpolateShannon::transposeMulti(SAMPLETYPE *, 
+                    const SAMPLETYPE *, 
+                    int &)
 {
     // not implemented
     assert(false);
diff --git a/source/SoundTouch/InterpolateShannon.h b/source/SoundTouch/InterpolateShannon.h
index 75876e1..e0c6fa5 100644
--- a/source/SoundTouch/InterpolateShannon.h
+++ b/source/SoundTouch/InterpolateShannon.h
@@ -63,7 +63,7 @@ public:
 
     void resetRegisters() override;
 
-    int getLatency() const
+    virtual int getLatency() const override
     {
         return 3;
     }
diff --git a/source/SoundTouch/TDStretch.cpp b/source/SoundTouch/TDStretch.cpp
index 243f7cc..e416a3a 100644
--- a/source/SoundTouch/TDStretch.cpp
+++ b/source/SoundTouch/TDStretch.cpp
@@ -54,25 +54,6 @@ using namespace soundtouch;
 
 #define max(x, y) (((x) > (y)) ? (x) : (y))
 
-/*****************************************************************************
- *
- * Constant definitions
- *
- *****************************************************************************/
-
-// Table for the hierarchical mixing position seeking algorithm
-const short _scanOffsets[5][24]={
-    { 124,  186,  248,  310,  372,  434,  496,  558,  620,  682,  744, 806,
-      868,  930,  992, 1054, 1116, 1178, 1240, 1302, 1364, 1426, 1488,   0},
-    {-100,  -75,  -50,  -25,   25,   50,   75,  100,    0,    0,    0,   0,
-        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,   0},
-    { -20,  -15,  -10,   -5,    5,   10,   15,   20,    0,    0,    0,   0,
-        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,   0},
-    {  -4,   -3,   -2,   -1,    1,    2,    3,    4,    0,    0,    0,   0,
-        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,   0},
-    { 121,  114,   97,  114,   98,  105,  108,   32,  104,   99,  117,  111,
-      116,  100,  110,  117,  111,  115,    0,    0,    0,    0,    0,   0}};
-
 /*****************************************************************************
  *
  * Implementation of the class 'TDStretch'
@@ -759,7 +740,7 @@ void TDStretch::acceptNewOverlapLength(int newOverlapLength)
 
 // Operator 'new' is overloaded so that it automatically creates a suitable instance 
 // depending on if we've a MMX/SSE/etc-capable CPU available or not.
-void * TDStretch::operator new(size_t s)
+void * TDStretch::operator new(size_t)
 {
     // Notice! don't use "new TDStretch" directly, use "newInstance" to create a new instance instead!
     ST_THROW_RT_ERROR("Error in TDStretch::new: Don't use 'new TDStretch' directly, use 'newInstance' member instead!");