diff --git a/include/STTypes.h b/include/STTypes.h
index 63950e1..c11a9d9 100644
--- a/include/STTypes.h
+++ b/include/STTypes.h
@@ -60,20 +60,6 @@ typedef unsigned long   ulong;
     #include "soundtouch_config.h"
 #endif
 
-#ifndef _WINDEF_
-    // if these aren't defined already by Windows headers, define now
-
-#if defined(__APPLE__)
-   typedef signed char BOOL;
-#else
-   typedef int BOOL;
-#endif 
-
-    #define FALSE   0
-    #define TRUE    1
-
-#endif  // _WINDEF_
-
 
 namespace soundtouch
 {
diff --git a/include/SoundTouch.h b/include/SoundTouch.h
index 8a5af72..db9100b 100644
--- a/include/SoundTouch.h
+++ b/include/SoundTouch.h
@@ -160,7 +160,7 @@ private:
     float virtualPitch;
 
     /// Flag: Has sample rate been set?
-    BOOL  bSrateSet;
+    bool  bSrateSet;
 
     /// Calculates effective rate & tempo valuescfrom 'virtualRate', 'virtualTempo' and 
     /// 'virtualPitch' parameters.
@@ -247,8 +247,8 @@ public:
     /// Changes a setting controlling the processing system behaviour. See the
     /// 'SETTING_...' defines for available setting ID's.
     /// 
-    /// \return 'TRUE' if the setting was succesfully changed
-    BOOL setSetting(int settingId,   ///< Setting ID number. see SETTING_... defines.
+    /// \return 'true' if the setting was succesfully changed
+    bool setSetting(int settingId,   ///< Setting ID number. see SETTING_... defines.
                     int value        ///< New setting value.
                     );
 
diff --git a/source/SoundStretch/RunParameters.cpp b/source/SoundStretch/RunParameters.cpp
index e5f569e..f68f0da 100644
--- a/source/SoundStretch/RunParameters.cpp
+++ b/source/SoundStretch/RunParameters.cpp
@@ -130,8 +130,8 @@ RunParameters::RunParameters(const int nParams, const char * const paramStr[])
     quick = 0;
     noAntiAlias = 0;
     goalBPM = 0;
-    speech = FALSE;
-    detectBPM = FALSE;
+    speech = false;
+    detectBPM = false;
 
     // Get input & output file names
     inFileName = (char*)paramStr[1];
@@ -262,7 +262,7 @@ void RunParameters::parseSwitchParam(const string &str)
 
         case 'b' :
             // switch '-bpm=xx'
-            detectBPM = TRUE;
+            detectBPM = true;
             try
             {
                 goalBPM = parseSwitchValue(str);
@@ -291,7 +291,7 @@ void RunParameters::parseSwitchParam(const string &str)
 
         case 's' :
             // switch '-speech'
-            speech = TRUE;
+            speech = true;
             break;
 
         default:
diff --git a/source/SoundStretch/RunParameters.h b/source/SoundStretch/RunParameters.h
index ecdb5d6..6b91be4 100644
--- a/source/SoundStretch/RunParameters.h
+++ b/source/SoundStretch/RunParameters.h
@@ -63,8 +63,8 @@ public:
     int   quick;
     int   noAntiAlias;
     float goalBPM;
-    BOOL  detectBPM;
-    BOOL  speech;
+    bool  detectBPM;
+    bool  speech;
 
     RunParameters(const int nParams, const char * const paramStr[]);
 };
diff --git a/source/SoundStretch/main.cpp b/source/SoundStretch/main.cpp
index 349576b..d100430 100644
--- a/source/SoundStretch/main.cpp
+++ b/source/SoundStretch/main.cpp
@@ -299,7 +299,7 @@ int main(const int nParams, const char * const paramStr[])
         // Open input & output files
         openFiles(&inFile, &outFile, params);
 
-        if (params->detectBPM == TRUE)
+        if (params->detectBPM == true)
         {
             // detect sound BPM (and adjust processing parameters
             //  accordingly if necessary)
diff --git a/source/SoundTouch/InterpolateShannon.cpp b/source/SoundTouch/InterpolateShannon.cpp
index 3f17d85..495c254 100644
--- a/source/SoundTouch/InterpolateShannon.cpp
+++ b/source/SoundTouch/InterpolateShannon.cpp
@@ -180,6 +180,6 @@ int InterpolateShannon::transposeMulti(SAMPLETYPE *pdest,
                     int &srcSamples)
 {
     // not implemented
-    assert(FALSE);
+    assert(false);
     return 0;
 }
diff --git a/source/SoundTouch/RateTransposer.cpp b/source/SoundTouch/RateTransposer.cpp
index 17a1617..80b5b6e 100644
--- a/source/SoundTouch/RateTransposer.cpp
+++ b/source/SoundTouch/RateTransposer.cpp
@@ -57,7 +57,7 @@ TransposerBase::ALGORITHM TransposerBase::algorithm = TransposerBase::CUBIC;
 // Constructor
 RateTransposer::RateTransposer() : FIFOProcessor(&outputBuffer)
 {
-    bUseAAFilter = TRUE;
+    bUseAAFilter = true;
 
     // Instantiates the anti-alias filter
     pAAFilter = new AAFilter(64);
@@ -75,14 +75,14 @@ RateTransposer::~RateTransposer()
 
 
 /// Enables/disables the anti-alias filter. Zero to disable, nonzero to enable
-void RateTransposer::enableAAFilter(BOOL newMode)
+void RateTransposer::enableAAFilter(bool newMode)
 {
     bUseAAFilter = newMode;
 }
 
 
 /// Returns nonzero if anti-alias filter is enabled.
-BOOL RateTransposer::isAAFilterEnabled() const
+bool RateTransposer::isAAFilterEnabled() const
 {
     return bUseAAFilter;
 }
@@ -139,7 +139,7 @@ void RateTransposer::processSamples(const SAMPLETYPE *src, uint nSamples)
 
     // If anti-alias filter is turned off, simply transpose without applying
     // the filter
-    if (bUseAAFilter == FALSE) 
+    if (bUseAAFilter == false) 
     {
         count = pTransposer->transpose(outputBuffer, inputBuffer);
         return;
diff --git a/source/SoundTouch/RateTransposer.h b/source/SoundTouch/RateTransposer.h
index adf79dc..701a7c4 100644
--- a/source/SoundTouch/RateTransposer.h
+++ b/source/SoundTouch/RateTransposer.h
@@ -118,7 +118,7 @@ protected:
     /// Output sample buffer
     FIFOSampleBuffer outputBuffer;
 
-    BOOL bUseAAFilter;
+    bool bUseAAFilter;
 
 
     /// Transposes sample rate by applying anti-alias filter to prevent folding. 
@@ -151,10 +151,10 @@ public:
     AAFilter *getAAFilter();
 
     /// Enables/disables the anti-alias filter. Zero to disable, nonzero to enable
-    void enableAAFilter(BOOL newMode);
+    void enableAAFilter(bool newMode);
 
     /// Returns nonzero if anti-alias filter is enabled.
-    BOOL isAAFilterEnabled() const;
+    bool isAAFilterEnabled() const;
 
     /// Sets new target rate. Normal rate = 1.0, smaller values represent slower 
     /// rate, larger faster rates.
diff --git a/source/SoundTouch/SoundTouch.cpp b/source/SoundTouch/SoundTouch.cpp
index 0de42de..ebca7ce 100644
--- a/source/SoundTouch/SoundTouch.cpp
+++ b/source/SoundTouch/SoundTouch.cpp
@@ -111,7 +111,7 @@ SoundTouch::SoundTouch()
     calcEffectiveRateAndTempo();
 
     channels = 0;
-    bSrateSet = FALSE;
+    bSrateSet = false;
 }
 
 
@@ -283,7 +283,7 @@ void SoundTouch::calcEffectiveRateAndTempo()
 // Sets sample rate.
 void SoundTouch::setSampleRate(uint srate)
 {
-    bSrateSet = TRUE;
+    bSrateSet = true;
     // set sample rate, leave other tempo changer parameters as they are.
     pTDStretch->setParameters((int)srate);
 }
@@ -293,7 +293,7 @@ void SoundTouch::setSampleRate(uint srate)
 // the input of the object.
 void SoundTouch::putSamples(const SAMPLETYPE *samples, uint nSamples)
 {
-    if (bSrateSet == FALSE) 
+    if (bSrateSet == false) 
     {
         ST_THROW_RT_ERROR("SoundTouch : Sample rate not defined");
     } 
@@ -388,7 +388,7 @@ void SoundTouch::flush()
 
 // Changes a setting controlling the processing system behaviour. See the
 // 'SETTING_...' defines for available setting ID's.
-BOOL SoundTouch::setSetting(int settingId, int value)
+bool SoundTouch::setSetting(int settingId, int value)
 {
     int sampleRate, sequenceMs, seekWindowMs, overlapMs;
 
@@ -399,36 +399,36 @@ BOOL SoundTouch::setSetting(int settingId, int value)
     {
         case SETTING_USE_AA_FILTER :
             // enables / disabless anti-alias filter
-            pRateTransposer->enableAAFilter((value != 0) ? TRUE : FALSE);
-            return TRUE;
+            pRateTransposer->enableAAFilter((value != 0) ? true : false);
+            return true;
 
         case SETTING_AA_FILTER_LENGTH :
             // sets anti-alias filter length
             pRateTransposer->getAAFilter()->setLength(value);
-            return TRUE;
+            return true;
 
         case SETTING_USE_QUICKSEEK :
             // enables / disables tempo routine quick seeking algorithm
-            pTDStretch->enableQuickSeek((value != 0) ? TRUE : FALSE);
-            return TRUE;
+            pTDStretch->enableQuickSeek((value != 0) ? true : false);
+            return true;
 
         case SETTING_SEQUENCE_MS:
             // change time-stretch sequence duration parameter
             pTDStretch->setParameters(sampleRate, value, seekWindowMs, overlapMs);
-            return TRUE;
+            return true;
 
         case SETTING_SEEKWINDOW_MS:
             // change time-stretch seek window length parameter
             pTDStretch->setParameters(sampleRate, sequenceMs, value, overlapMs);
-            return TRUE;
+            return true;
 
         case SETTING_OVERLAP_MS:
             // change time-stretch overlap length parameter
             pTDStretch->setParameters(sampleRate, sequenceMs, seekWindowMs, value);
-            return TRUE;
+            return true;
 
         default :
-            return FALSE;
+            return false;
     }
 }
 
diff --git a/source/SoundTouch/TDStretch.cpp b/source/SoundTouch/TDStretch.cpp
index b1fa670..c63f38d 100644
--- a/source/SoundTouch/TDStretch.cpp
+++ b/source/SoundTouch/TDStretch.cpp
@@ -84,15 +84,15 @@ static const short _scanOffsets[5][24]={
 
 TDStretch::TDStretch() : FIFOProcessor(&outputBuffer)
 {
-    bQuickSeek = FALSE;
+    bQuickSeek = false;
     channels = 2;
 
     pMidBuffer = NULL;
     pMidBufferUnaligned = NULL;
     overlapLength = 0;
 
-    bAutoSeqSetting = TRUE;
-    bAutoSeekSetting = TRUE;
+    bAutoSeqSetting = true;
+    bAutoSeekSetting = true;
 
 //    outDebt = 0;
     skipFract = 0;
@@ -132,23 +132,23 @@ void TDStretch::setParameters(int aSampleRate, int aSequenceMS,
     if (aSequenceMS > 0)
     {
         this->sequenceMs = aSequenceMS;
-        bAutoSeqSetting = FALSE;
+        bAutoSeqSetting = false;
     } 
     else if (aSequenceMS == 0)
     {
         // if zero, use automatic setting
-        bAutoSeqSetting = TRUE;
+        bAutoSeqSetting = true;
     }
 
     if (aSeekWindowMS > 0) 
     {
         this->seekWindowMs = aSeekWindowMS;
-        bAutoSeekSetting = FALSE;
+        bAutoSeekSetting = false;
     } 
     else if (aSeekWindowMS == 0) 
     {
         // if zero, use automatic setting
-        bAutoSeekSetting = TRUE;
+        bAutoSeekSetting = true;
     }
 
     calcSeqParameters();
@@ -231,14 +231,14 @@ void TDStretch::clear()
 
 // Enables/disables the quick position seeking algorithm. Zero to disable, nonzero
 // to enable
-void TDStretch::enableQuickSeek(BOOL enable)
+void TDStretch::enableQuickSeek(bool enable)
 {
     bQuickSeek = enable;
 }
 
 
 // Returns nonzero if the quick seeking algorithm is enabled.
-BOOL TDStretch::isQuickSeekEnabled() const
+bool TDStretch::isQuickSeekEnabled() const
 {
     return bQuickSeek;
 }
diff --git a/source/SoundTouch/TDStretch.h b/source/SoundTouch/TDStretch.h
index 4ce8726..18849b2 100644
--- a/source/SoundTouch/TDStretch.h
+++ b/source/SoundTouch/TDStretch.h
@@ -125,14 +125,14 @@ protected:
     float skipFract;
     FIFOSampleBuffer outputBuffer;
     FIFOSampleBuffer inputBuffer;
-    BOOL bQuickSeek;
+    bool bQuickSeek;
 
     int sampleRate;
     int sequenceMs;
     int seekWindowMs;
     int overlapMs;
-    BOOL bAutoSeqSetting;
-    BOOL bAutoSeekSetting;
+    bool bAutoSeqSetting;
+    bool bAutoSeekSetting;
 
     void acceptNewOverlapLength(int newOverlapLength);
 
@@ -195,10 +195,10 @@ public:
 
     /// Enables/disables the quick position seeking algorithm. Zero to disable, 
     /// nonzero to enable
-    void enableQuickSeek(BOOL enable);
+    void enableQuickSeek(bool enable);
 
     /// Returns nonzero if the quick seeking algorithm is enabled.
-    BOOL isQuickSeekEnabled() const;
+    bool isQuickSeekEnabled() const;
 
     /// Sets routine control parameters. These control are certain time constants
     /// defining how the sound is stretched to the desired duration.