In offline mode, create the resampler only if needed (i.e. if the pitch ratio is still 1.0 at the point when process is first called); and use plain 2048-sample fft with unity stretch

src/finer/R3Stretcher.h

@@ -310,6 +310,7 @@ protected:
     ProcessMode m_mode;
 
     void consume();
+    void createResampler();
     void calculateHop();
     void updateRatioFromMap();
     void analyseChannel(int channel, int inhop, int prevInhop, int prevOuthop);