diff --git a/configure.ac b/configure.ac
index bdf4e63..0757ca2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,7 +33,7 @@ if test "x$GCC" = "xyes"; then
   esac
   case " $CXXFLAGS " in
     *[\ \	]-fPIC\ -Wall[\ \	]*) ;;
-    *) CXXFLAGS="$CXXFLAGS -fPIC -Wall" ;;
+    *) CXXFLAGS="$CXXFLAGS -fPIC -Wall -Woverloaded-virtual" ;;
   esac
 fi
 changequote([,])dnl
diff --git a/src/AudioCurve.cpp b/src/AudioCurve.cpp
index 118caf4..8cf247b 100644
--- a/src/AudioCurve.cpp
+++ b/src/AudioCurve.cpp
@@ -31,9 +31,9 @@ AudioCurve::~AudioCurve()
 }
 
 float
-AudioCurve::process(const double *R__ mag, size_t increment)
+AudioCurve::processDouble(const double *R__ mag, size_t increment)
 {
-    cerr << "WARNING: Using inefficient AudioCurve::process(double)" << endl;
+    cerr << "AudioCurve::processDouble: WARNING: Using inefficient and lossy conversion for AudioCurve::process(float)" << endl;
     float *tmp = new float[m_windowSize];
     for (int i = 0; i < int(m_windowSize); ++i) tmp[i] = float(mag[i]);
     float df = process(tmp, increment);
diff --git a/src/AudioCurve.h b/src/AudioCurve.h
index 7896308..a34a4aa 100644
--- a/src/AudioCurve.h
+++ b/src/AudioCurve.h
@@ -31,7 +31,7 @@ public:
     virtual void setWindowSize(size_t newSize) = 0;
     
     virtual float process(const float *R__ mag, size_t increment) = 0;
-    virtual float process(const double *R__ mag, size_t increment);
+    virtual float processDouble(const double *R__ mag, size_t increment);
     virtual void reset() = 0;
 
 protected:
diff --git a/src/StretcherChannelData.cpp b/src/StretcherChannelData.cpp
index 968feb5..240df23 100644
--- a/src/StretcherChannelData.cpp
+++ b/src/StretcherChannelData.cpp
@@ -281,6 +281,16 @@ RubberBandStretcher::Impl::ChannelData::reset()
 
     if (resampler) resampler->reset();
 
+    size_t size = inbuf->getSize();
+
+    for (size_t i = 0; i < size; ++i) {
+        accumulator[i] = 0.f;
+        windowAccumulator[i] = 0.f;
+    }
+
+    // Avoid dividing opening sample (which will be discarded anyway) by zero
+    windowAccumulator[0] = 1.f;
+    
     accumulatorFill = 0;
     prevIncrement = 0;
     chunkCount = 0;
diff --git a/src/StretcherProcess.cpp b/src/StretcherProcess.cpp
index 3f7d1fb..2699a27 100644
--- a/src/StretcherProcess.cpp
+++ b/src/StretcherProcess.cpp
@@ -447,8 +447,8 @@ RubberBandStretcher::Impl::calculateIncrements(size_t &phaseIncrementRtn,
 
     if (m_channels == 1) {
 
-        df = m_phaseResetAudioCurve->process(cd.mag, m_increment);
-        silent = (m_silentAudioCurve->process(cd.mag, m_increment) > 0.f);
+        df = m_phaseResetAudioCurve->processDouble(cd.mag, m_increment);
+        silent = (m_silentAudioCurve->processDouble(cd.mag, m_increment) > 0.f);
 
     } else {
 
@@ -463,8 +463,8 @@ RubberBandStretcher::Impl::calculateIncrements(size_t &phaseIncrementRtn,
             }
         }
     
-        df = m_phaseResetAudioCurve->process(tmp, m_increment);
-        silent = (m_silentAudioCurve->process(tmp, m_increment) > 0.f);
+        df = m_phaseResetAudioCurve->processDouble(tmp, m_increment);
+        silent = (m_silentAudioCurve->processDouble(tmp, m_increment) > 0.f);
     }
 
     int incr = m_stretchCalculator->calculateSingle