diff --git a/cpp/StftPitchShift/StftPitchShift.cpp b/cpp/StftPitchShift/StftPitchShift.cpp
index 212e2b3..08a9a6e 100644
--- a/cpp/StftPitchShift/StftPitchShift.cpp
+++ b/cpp/StftPitchShift/StftPitchShift.cpp
@@ -14,12 +14,29 @@ StftPitchShift::StftPitchShift(
   const double samplerate,
   const bool normalization,
   const bool chronometry) :
-  fft(std::make_shared<RFFT>()),
-  framesize(framesize),
-  hopsize(hopsize),
-  samplerate(samplerate),
-  normalization(normalization),
-  chronometry(chronometry)
+  StftPitchShift(
+    std::make_shared<RFFT>(),
+    std::make_tuple(framesize, framesize),
+    hopsize,
+    samplerate,
+    normalization,
+    chronometry)
+{
+}
+
+StftPitchShift::StftPitchShift(
+  const std::tuple<size_t, size_t> framesize,
+  const size_t hopsize,
+  const double samplerate,
+  const bool normalization,
+  const bool chronometry) :
+  StftPitchShift(
+    std::make_shared<RFFT>(),
+    framesize,
+    hopsize,
+    samplerate,
+    normalization,
+    chronometry)
 {
 }
 
@@ -30,6 +47,23 @@ StftPitchShift::StftPitchShift(
   const double samplerate,
   const bool normalization,
   const bool chronometry) :
+  StftPitchShift(
+    fft,
+    std::make_tuple(framesize, framesize),
+    hopsize,
+    samplerate,
+    normalization,
+    chronometry)
+{
+}
+
+StftPitchShift::StftPitchShift(
+  const std::shared_ptr<FFT> fft,
+  const std::tuple<size_t, size_t> framesize,
+  const size_t hopsize,
+  const double samplerate,
+  const bool normalization,
+  const bool chronometry) :
   fft(fft),
   framesize(framesize),
   hopsize(hopsize),
diff --git a/cpp/StftPitchShift/StftPitchShift.h b/cpp/StftPitchShift/StftPitchShift.h
index 3a0c4a4..5ad51da 100644
--- a/cpp/StftPitchShift/StftPitchShift.h
+++ b/cpp/StftPitchShift/StftPitchShift.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <memory>
+#include <tuple>
 #include <vector>
 
 #include <StftPitchShift/FFT.h>
@@ -16,7 +17,7 @@ namespace stftpitchshift
   public:
 
     /**
-     * @param framesize The STFT frame size in samples.
+     * @param framesize The STFT frame size in samples (analysis = synthesis).
      * @param hopsize The STFT hop size in samples.
      * @param samplerate The sample rate of the signal in hertz.
      * @param normalization Optionally enable spectral rms normalization.
@@ -29,9 +30,23 @@ namespace stftpitchshift
       const bool normalization = false,
       const bool chronometry = false);
 
+    /**
+     * @param framesize The STFT frame size in samples (analysis >= synthesis).
+     * @param hopsize The STFT hop size in samples.
+     * @param samplerate The sample rate of the signal in hertz.
+     * @param normalization Optionally enable spectral rms normalization.
+     * @param chronometry Optionally enable runtime measurements.
+     */
+    StftPitchShift(
+      const std::tuple<size_t, size_t> framesize,
+      const size_t hopsize,
+      const double samplerate,
+      const bool normalization = false,
+      const bool chronometry = false);
+
     /**
      * @param fft The custom FFT calculation instance.
-     * @param framesize The STFT frame size in samples.
+     * @param framesize The STFT frame size in samples (analysis = synthesis).
      * @param hopsize The STFT hop size in samples.
      * @param samplerate The sample rate of the signal in hertz.
      * @param normalization Optionally enable spectral rms normalization.
@@ -45,6 +60,22 @@ namespace stftpitchshift
       const bool normalization = false,
       const bool chronometry = false);
 
+    /**
+     * @param fft The custom FFT calculation instance.
+     * @param framesize The STFT frame size in samples (analysis >= synthesis).
+     * @param hopsize The STFT hop size in samples.
+     * @param samplerate The sample rate of the signal in hertz.
+     * @param normalization Optionally enable spectral rms normalization.
+     * @param chronometry Optionally enable runtime measurements.
+     */
+    StftPitchShift(
+      const std::shared_ptr<FFT> fft,
+      const std::tuple<size_t, size_t> framesize,
+      const size_t hopsize,
+      const double samplerate,
+      const bool normalization = false,
+      const bool chronometry = false);
+
     /**
      * @param input The input signal.
      * @param output The output signal of the equal size.
@@ -168,7 +199,7 @@ namespace stftpitchshift
   private:
 
     const std::shared_ptr<FFT> fft;
-    const size_t framesize;
+    const std::tuple<size_t, size_t> framesize;
     const size_t hopsize;
     const double samplerate;
     const bool normalization;
diff --git a/cpp/StftPitchShift/StftPitchShiftCore.h b/cpp/StftPitchShift/StftPitchShiftCore.h
index b5e3db3..8f3eae1 100644
--- a/cpp/StftPitchShift/StftPitchShiftCore.h
+++ b/cpp/StftPitchShift/StftPitchShiftCore.h
@@ -21,6 +21,18 @@ namespace stftpitchshift
       const size_t framesize,
       const size_t hopsize,
       const double samplerate) :
+      StftPitchShiftCore(
+        std::make_shared<RFFT>(),
+        std::make_tuple(framesize, framesize),
+        hopsize,
+        samplerate)
+    {
+    }
+
+    StftPitchShiftCore(
+      const std::tuple<size_t, size_t> framesize,
+      const size_t hopsize,
+      const double samplerate) :
       StftPitchShiftCore(
         std::make_shared<RFFT>(),
         framesize,
@@ -34,14 +46,27 @@ namespace stftpitchshift
       const size_t framesize,
       const size_t hopsize,
       const double samplerate) :
+      StftPitchShiftCore(
+        fft,
+        std::make_tuple(framesize, framesize),
+        hopsize,
+        samplerate)
+    {
+    }
+
+    StftPitchShiftCore(
+      const std::shared_ptr<FFT> fft,
+      const std::tuple<size_t, size_t> framesize,
+      const size_t hopsize,
+      const double samplerate) :
       fft(fft),
       framesize(framesize),
       hopsize(hopsize),
       samplerate(samplerate),
       vocoder(framesize, hopsize, samplerate),
-      pitcher(framesize, samplerate),
-      cepster(fft, framesize, samplerate),
-      envelope(framesize / 2 + 1)
+      pitcher(std::get<0>(framesize), samplerate),
+      cepster(fft, std::get<0>(framesize), samplerate),
+      envelope(std::get<0>(framesize) / 2 + 1)
     {
     }
 
@@ -147,7 +172,7 @@ namespace stftpitchshift
   private:
 
     const std::shared_ptr<FFT> fft;
-    const size_t framesize;
+    const std::tuple<size_t, size_t> framesize;
     const size_t hopsize;
     const double samplerate;
 
diff --git a/python/stftpitchshift/stftpitchshift.py b/python/stftpitchshift/stftpitchshift.py
index ca04e14..572a50d 100644
--- a/python/stftpitchshift/stftpitchshift.py
+++ b/python/stftpitchshift/stftpitchshift.py
@@ -113,7 +113,6 @@ def isnotnormal(x):
             frames = normalize(frames, frames0)
 
         frames = decode(frames, framesize, hopsize, samplerate)
-
         output = istft(frames, framesize, hopsize)
 
         # disable reference count check on resize,