diff --git a/Core/config.h b/Core/config.h
index 5eacba42..a5be10c1 100644
--- a/Core/config.h
+++ b/Core/config.h
@@ -45,14 +45,22 @@ inline void null_func(const char *format, ...) { }
 #define DbgPrintf DbgEmpty
 #endif
 
-#define SWVERSION           "1.3.0 RC1"	  
+#define SWVERSION           "1.3.3 Alfa"	  
 #define SETTINGS_IDENTIFIER	"sddc_1.06"
 #define SWNAME				"ExtIO_sddc.dll"
 
 #define	QUEUE_SIZE 32
 #define WIDEFFTN  // test FFTN 8192 
 
-#define FFTN_R_ADC (8192)       // FFTN used for ADC real stream DDC  tested at  2048, 8192, 32768, 131072
+#define FFTN_R_ADC (32768)       // FFTN used for ADC real stream DDC  tested at  2048, 8192, 32768, 131072
+#define HALF_FFT (FFTN_R_ADC / 2) 
+//#define HTLEN ( HALF_FFT / 4 + 1)			// ok
+#define HTLEN ( HALF_FFT * 3 / 8 + 1 )	    // ok  
+//#define HTLEN ( HALF_FFT * 7 / 16 + 1 )	// ok ?
+//#define HTLEN ( HALF_FFT / 2 + 1 )		// distortion at edges ???? 
+#ifdef _WIN32
+#define _SOFT_TONE_DEBUG   // Generate soft tone period transferSamples debug
+#endif
 
 // GAINFACTORS to be adjusted with lab reference source measured with HDSDR Smeter rms mode  
 #define BBRF103_GAINFACTOR 	(7.8e-8f)       // BBRF103
diff --git a/Core/fft_mt_r2iq.cpp b/Core/fft_mt_r2iq.cpp
index 9bcf5803..26693c94 100644
--- a/Core/fft_mt_r2iq.cpp
+++ b/Core/fft_mt_r2iq.cpp
@@ -40,6 +40,9 @@ fft_mt_r2iq::fft_mt_r2iq() :
 	r2iqControlClass(),
 	filterHw(nullptr)
 {
+#ifdef    _SOFT_TONE_DEBUG
+	genphase = 0.0;
+#endif
 	mtunebin = halfFft / 4;
 	mfftdim[0] = halfFft;
 	for (int i = 1; i < NDECIDX; i++)
@@ -166,7 +169,7 @@ void fft_mt_r2iq::Init(float gain, ringbuffer<int16_t> *input, ringbuffer<float>
 		}
 
 		filterplan_t2f_c2c = fftwf_plan_dft_1d(halfFft, pfilterht, filterHw[0], FFTW_FORWARD, FFTW_MEASURE);
-		float *pht = new float[halfFft / 4 + 1];
+		float *pht = new float[HTLEN];
 		const float Astop = 120.0f;
 		const float relPass = 0.85f;  // 85% of Nyquist should be usable
 		const float relStop = 1.1f;   // 'some' alias back into transition band is OK
@@ -176,7 +179,7 @@ void fft_mt_r2iq::Init(float gain, ringbuffer<int16_t> *input, ringbuffer<float>
 			//   to allow same stopband-attenuation for all decimations
 			float Bw = 64.0f / mratio[d];
 			// Bw *= 0.8f;  // easily visualize Kaiser filter's response
-			KaiserWindow(halfFft / 4 + 1, Astop, relPass * Bw / 128.0f, relStop * Bw / 128.0f, pht);
+			KaiserWindow(HTLEN, Astop, relPass * Bw / 128.0f, relStop * Bw / 128.0f, pht);
 
 			float gainadj = gain * 2048.0f / (float)FFTN_R_ADC; // reference is FFTN_R_ADC == 2048
 
@@ -185,7 +188,7 @@ void fft_mt_r2iq::Init(float gain, ringbuffer<int16_t> *input, ringbuffer<float>
 				pfilterht[t][0] = pfilterht[t][1]= 0.0F;
 			}
 		
-			for (int t = 0; t < (halfFft/4+1); t++)
+			for (int t = 0; t < (HTLEN); t++)
 			{
 				pfilterht[halfFft-1-t][0] = gainadj * pht[t];
 			}
diff --git a/Core/fft_mt_r2iq.h b/Core/fft_mt_r2iq.h
index 8aa6f766..b29fb655 100644
--- a/Core/fft_mt_r2iq.h
+++ b/Core/fft_mt_r2iq.h
@@ -26,7 +26,33 @@ class fft_mt_r2iq : public r2iqControlClass
     void TurnOff(void);
     bool IsOn(void);
 
-protected:
+protected: 
+
+#ifdef    _SOFT_TONE_DEBUG
+    double genphase;
+#define PI ( 3.14159265358979323846 )
+    float  burst[transferSamples + HALF_FFT];
+    void init_burst(void)
+    {
+        for (int m = 0; m < transferSamples + HALF_FFT; m++)
+        {
+            genphase += (PI * 2048.0) / (double)(transferSamples);
+
+            if (genphase > 2.0 * PI) genphase -= 2.0 * PI;
+
+            burst[m] = 32768.0F * sin(genphase);
+        }
+    }
+    void generate_float( float* output, int size)
+    {
+        for (int m = 0; m < size; m++)
+        {
+            output[m] = burst[m];
+            // output[m] = 32768.0F;  // generate DC
+
+        }
+    }
+#endif
 
     template<bool rand> void convert_float(const int16_t *input, float* output, int size)
     {
diff --git a/Core/fft_mt_r2iq_impl.hpp b/Core/fft_mt_r2iq_impl.hpp
index 7d9662b1..2532b0f6 100644
--- a/Core/fft_mt_r2iq_impl.hpp
+++ b/Core/fft_mt_r2iq_impl.hpp
@@ -9,7 +9,9 @@
 	plan_f2t_c2c = &plans_f2t_c2c[decimate];
 	fftwf_complex* pout = nullptr;
 	int decimate_count = 0;
-
+#ifdef _SOFT_TONE_DEBUG
+	init_burst(); // if DEBUG_LENGTH
+#endif
 	while (r2iqOn) {
 		const int16_t *dataADC;  // pointer to input data
 		const int16_t *endloop;    // pointer to end data to be copied to beginning
@@ -49,8 +51,12 @@
 		}
 		else
 		{
+#ifdef _SOFT_TONE_DEBUG
+			generate_float(inloop, transferSamples + halfFft);
+#else
 			convert_float<true>(endloop, inloop, halfFft);
 			convert_float<true>(dataADC, inloop + halfFft, transferSamples);
+#endif
 		}
 
 #if PRINT_INPUT_RANGE