diff --git a/src/Resampler.cpp b/src/Resampler.cpp
index 26633e2..69cde65 100644
--- a/src/Resampler.cpp
+++ b/src/Resampler.cpp
@@ -92,7 +92,11 @@ D_SRC::D_SRC(Resampler::Quality quality, int channels, int maxBufferSize,
                     SRC_SINC_FASTEST,
                     channels, &err);
 
-    //!!! check err, throw
+    if (err) {
+        std::cerr << "Resampler::Resampler: failed to create libsamplerate resampler: " 
+                  << src_strerror(err) << std::endl;
+        throw Resampler::ImplementationError; //!!! of course, need to catch this!
+    }
 
     if (maxBufferSize > 0 && m_channels > 1) {
         //!!! alignment?
@@ -153,7 +157,11 @@ D_SRC::resample(const float *const R__ *const R__ in,
 
     int err = src_process(m_src, &data);
 
-    //!!! check err, respond appropriately
+    if (err) {
+        std::cerr << "Resampler::process: libsamplerate error: "
+                  << src_strerror(err) << std::endl;
+        throw Resampler::ImplementationError; //!!! of course, need to catch this!
+    }
 
     if (m_channels > 1) {
         for (int i = 0; i < data.output_frames_gen; ++i) {
diff --git a/src/Resampler.h b/src/Resampler.h
index 40aad5f..3c4af40 100644
--- a/src/Resampler.h
+++ b/src/Resampler.h
@@ -27,6 +27,7 @@ class Resampler
 {
 public:
     enum Quality { Best, FastestTolerable, Fastest };
+    enum Exception { ImplementationError };
 
     /**
      * Construct a resampler with the given quality level and channel
diff --git a/src/StretcherImpl.cpp b/src/StretcherImpl.cpp
index cca8c32..04820bf 100644
--- a/src/StretcherImpl.cpp
+++ b/src/StretcherImpl.cpp
@@ -982,7 +982,7 @@ RubberBandStretcher::Impl::process(const float *const *input, size_t samples, bo
 
     bool allConsumed = false;
 
-    map<size_t, size_t> consumed;
+    size_t *consumed = (size_t *)alloca(m_channels * sizeof(size_t));
     for (size_t c = 0; c < m_channels; ++c) {
         consumed[c] = 0;
     }
diff --git a/src/StretcherProcess.cpp b/src/StretcherProcess.cpp
index c848376..de1a51d 100644
--- a/src/StretcherProcess.cpp
+++ b/src/StretcherProcess.cpp
@@ -839,16 +839,21 @@ RubberBandStretcher::Impl::formantShiftChunk(size_t channel)
 
     const int sz = m_windowSize;
     const int hs = m_windowSize/2;
+    const double denom = sz;
 
-    cd.fft->inverseCepstral(mag, dblbuf);
     
-    double denom = sz;
+    cd.fft->inverseCepstral(mag, dblbuf);
+
     for (int i = 0; i < sz; ++i) {
         dblbuf[i] /= denom;
     }
 
     //!!! calculate this value -- the divisor should be the highest fundamental frequency we expect to find, plus a bit
     const int cutoff = m_sampleRate / 700;
+//    const int cutoff = 1000;
+//    const int cutoff = 20;
+
+//    cerr <<"cutoff = "<< cutoff << ", m_sampleRate/cutoff = " << m_sampleRate/cutoff << ", m_sampleRate/700 = " << m_sampleRate/700 << endl;
 
     dblbuf[0] /= 2;
     dblbuf[cutoff-1] /= 2;
@@ -859,6 +864,7 @@ RubberBandStretcher::Impl::formantShiftChunk(size_t channel)
 
     cd.fft->forward(dblbuf, envelope, 0);
 
+
     for (int i = 0; i <= hs; ++i) {
         envelope[i] = exp(envelope[i]);
     }
@@ -887,6 +893,7 @@ RubberBandStretcher::Impl::formantShiftChunk(size_t channel)
 
     for (int i = 0; i <= hs; ++i) {
         mag[i] *= envelope[i];
+//        mag[i] = envelope[i];
     }
 
     cd.unchanged = false;