diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100644
new mode 100755
index 587daf7b995530424d11b7713e094e2076308371..00e65c268106d9d554ad2b6a92220bea91cc415c
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -190,6 +190,7 @@
 #define NONBE_FIX_931_IGF_STEREO_DEC_NOISE	                  /* FhG: issue #931: fix noise substitution in the stereo IGF decoder      */
 #define FIX_CRASH_LONG_BRIR                /* Orange : port 1202 Fix crash when long BRIR is set */
 #define NONBE_FIX_943_RECONFIG_IGF_AFTER_SETTING_BW           /* FhG: issue 943: fix crash in BW switchin from WB in MDCT-Stereo core encoder */
+#define FIX_911_REMOVE_CREND_DUPLICATION                /* VA: issue 911: resolve duplication of CRend binaural external renderer function */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_rend/ivas_crend_fx.c b/lib_rend/ivas_crend_fx.c
index 6e4247bc978f4f997c8da4c18ffa2d716e76efab..a00bccf2129daf8729e09ab34ae35ca696880376 100644
--- a/lib_rend/ivas_crend_fx.c
+++ b/lib_rend/ivas_crend_fx.c
@@ -1426,6 +1426,11 @@ ivas_error ivas_rend_initCrendWrapper(
     ( *pCrend )->binaural_latency_ns = 0;
     move32();
     ( *pCrend )->hHrtfCrend = NULL;
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    ( *pCrend )->io_qfactor = 0;
+    move16();
+    ( *pCrend )->p_io_qfactor = &( *pCrend )->io_qfactor;
+#endif
 
 #ifdef SPLIT_REND_WITH_HEAD_ROT
     FOR( pos_idx = 0; pos_idx < num_poses; pos_idx++ )
@@ -2109,6 +2114,7 @@ static ivas_error ivas_rend_crendConvolver(
     return IVAS_ERR_OK;
 }
 
+#ifndef FIX_911_REMOVE_CREND_DUPLICATION
 /*-----------------------------------------------------------------------------------------*
  * Function ivas_rend_crend_Process()
  *
@@ -2278,6 +2284,7 @@ ivas_error ivas_rend_crendProcess(
     pop_wmops();
     return IVAS_ERR_OK;
 }
+#endif
 
 /*-----------------------------------------------------------------------------------------*
  * Function ivas_rend_crendProcessSubframe()
@@ -2351,24 +2358,74 @@ ivas_error ivas_rend_crendProcessSubframe(
     {
         p_pcm_tmp_fx[ch] = pcm_tmp_fx[ch];
     }
-    slot_size = hTcBuffer->n_samples_granularity;
-    move16();
 
-    /* loop for synthesis, assume we always have to render in multiples of 5ms subframes with spills */
-    slots_to_render = s_min( sub( hTcBuffer->num_slots, hTcBuffer->slots_rendered ), idiv1616( n_samples_to_render, slot_size ) );
-    first_sf = hTcBuffer->subframes_rendered;
-    move16();
-    last_sf = first_sf;
-    move16();
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    IF( hTcBuffer != NULL )
+    {
+#endif
+        slot_size = hTcBuffer->n_samples_granularity;
+        move16();
 
-    WHILE( slots_to_render > 0 )
+        /* loop for synthesis, assume we always have to render in multiples of 5ms subframes with spills */
+        slots_to_render = s_min( sub( hTcBuffer->num_slots, hTcBuffer->slots_rendered ), idiv1616( n_samples_to_render, slot_size ) );
+        first_sf = hTcBuffer->subframes_rendered;
+        move16();
+        last_sf = first_sf;
+        move16();
+
+        WHILE( slots_to_render > 0 )
+        {
+            slots_to_render = sub( slots_to_render, hTcBuffer->subframe_nbslots[last_sf] );
+            last_sf = add( last_sf, 1 );
+        }
+
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        subframe_len = -1; /* will be set later */
+        move16();
+    }
+    ELSE
     {
-        slots_to_render = sub( slots_to_render, hTcBuffer->subframe_nbslots[last_sf] );
-        last_sf = add( last_sf, 1 );
+        Word16 n_den, den, last_sf_tmp;
+
+        SWITCH( output_Fs )
+        {
+            case 48000:
+                subframe_len = L_SUBFRAME_48k;
+                move16();
+                BREAK;
+            case 32000:
+                subframe_len = L_SUBFRAME_32k;
+                move16();
+                BREAK;
+            case 16000:
+            default:
+                subframe_len = L_SUBFRAME_16k;
+                move16();
+                BREAK;
+        }
+
+        first_sf = 0;
+        move16();
+        last_sf = idiv1616( n_samples_to_render, subframe_len );
+
+        n_den = norm_s( subframe_len );
+        den = shl( subframe_len, n_den );
+        last_sf_tmp = div_s( n_samples_to_render, den );
+        last_sf = shr( last_sf_tmp, sub( 15, n_den ) );
     }
+#endif
+
     FOR( subframe_idx = first_sf; subframe_idx < last_sf; subframe_idx++ )
     {
-        subframe_len = imult1616( hTcBuffer->subframe_nbslots[subframe_idx], hTcBuffer->n_samples_granularity );
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        if ( hTcBuffer != NULL )
+        {
+#endif
+            subframe_len = imult1616( hTcBuffer->subframe_nbslots[subframe_idx], hTcBuffer->n_samples_granularity );
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        }
+#endif
+
         /* Early Reflections */
         IF( hCrend->reflections != NULL )
         {
@@ -2432,6 +2489,7 @@ ivas_error ivas_rend_crendProcessSubframe(
                 }
             }
 #endif
+
             FOR( ch = 0; ch < nchan_in; ch++ )
             {
                 tc_local_fx[ch] += subframe_len;
@@ -2440,13 +2498,22 @@ ivas_error ivas_rend_crendProcessSubframe(
             {
                 p_pcm_tmp_fx[ch] += subframe_len;
             }
-            hTcBuffer->slots_rendered = add( hTcBuffer->subframe_nbslots[subframe_idx], hTcBuffer->slots_rendered );
-            move16();
+
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+            if ( hTcBuffer != NULL )
+            {
+#endif
+                hTcBuffer->slots_rendered = add( hTcBuffer->subframe_nbslots[subframe_idx], hTcBuffer->slots_rendered );
+                move16();
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+            }
+#endif
         }
         ELSE
         {
             return IVAS_ERR_INVALID_INPUT_FORMAT;
         }
+
         /* update combined orientation access index */
         ivas_combined_orientation_update_index( hCombinedOrientationData, subframe_len );
     }
@@ -2468,14 +2535,23 @@ ivas_error ivas_rend_crendProcessSubframe(
             }
         }
     }
+
     /* move to output */
     FOR( ch = 0; ch < nchan_out; ch++ )
     {
         MVR2R_WORD32( pcm_tmp_fx[ch], output[ch], n_samples_to_render ); // Qx
     }
 
-    hTcBuffer->subframes_rendered = last_sf;
-    move16();
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    if ( hTcBuffer != NULL )
+    {
+#endif
+        hTcBuffer->subframes_rendered = last_sf;
+        move16();
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    }
+#endif
+
     pop_wmops();
 
     return IVAS_ERR_OK;
diff --git a/lib_rend/ivas_prot_rend_fx.h b/lib_rend/ivas_prot_rend_fx.h
index e44e81d05cc062c17cf19e3f16a851f9934eac44..b365aa7672b1cab749b56f8ccfb24751dc394115 100644
--- a/lib_rend/ivas_prot_rend_fx.h
+++ b/lib_rend/ivas_prot_rend_fx.h
@@ -892,6 +892,8 @@ ivas_error ivas_rend_initCrendWrapper(
     CREND_WRAPPER_HANDLE *pCrend 
 #endif
 );
+
+#ifndef FIX_911_REMOVE_CREND_DUPLICATION
 ivas_error ivas_rend_crendProcess(
     const CREND_WRAPPER *pCrend,
     const AUDIO_CONFIG inConfig,
@@ -909,6 +911,7 @@ ivas_error ivas_rend_crendProcess(
     const Word16 num_subframes                                 /* i  : number of subframes to render */
 #endif
 );
+#endif
 ivas_error ivas_rend_crendProcessSubframe(
     const CREND_WRAPPER *pCrend,                                /* i/o: Crend wrapper handle                    */
     const AUDIO_CONFIG inConfig,                                /* i  : input audio configuration               */
diff --git a/lib_rend/lib_rend.c b/lib_rend/lib_rend.c
index 0dbbef51712484f5af76415e6cabe0502eb9c09c..5babc6af9419079b537d723dff2cd171bd81a4d2 100644
--- a/lib_rend/lib_rend.c
+++ b/lib_rend/lib_rend.c
@@ -5982,10 +5982,14 @@ static ivas_error renderIsmToBinauralRoom(
 
 #ifdef SPLIT_REND_WITH_HEAD_ROT
     /* render 7_1_4 with BRIRs */
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    IF( NE_32( ( error = ivas_rend_crendProcessSubframe( ismInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, IVAS_AUDIO_CONFIG_BINAURAL_ROOM_IR, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer, p_tmpRendBuffer, ismInput->base.inputBuffer.config.numSamplesPerChannel, *ismInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
+#else
     IF( NE_32( ( error = ivas_rend_crendProcess( ismInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, IVAS_AUDIO_CONFIG_BINAURAL_ROOM_IR,
                                                  NULL, NULL, NULL, NULL, p_tmpRendBuffer, *ismInput->base.ctx.pOutSampleRate,
                                                  getNumSubframesInBuffer( &outAudio, *ismInput->base.ctx.pOutSampleRate ), 0 ) ),
                IVAS_ERR_OK ) )
+#endif
 #else
     /* render 7_1_4 with BRIRs */
     IF( NE_32( ( error = ivas_rend_crendProcess( ismInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, IVAS_AUDIO_CONFIG_BINAURAL_ROOM_IR,
@@ -6802,9 +6806,13 @@ static ivas_error renderMcToBinaural(
 
         /* call CREND */
 #ifdef SPLIT_REND_WITH_HEAD_ROT
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer_fx, p_tmpRendBuffer_fx, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
+#else
         IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, p_tmpRendBuffer_fx, *mcInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &outAudio, *mcInput->base.ctx.pOutSampleRate ), 0 ) ),
                    IVAS_ERR_OK ) )
+#endif
 #else
         IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, p_tmpRendBuffer_fx, *mcInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &outAudio, *mcInput->base.ctx.pOutSampleRate ) ) ),
@@ -6813,6 +6821,7 @@ static ivas_error renderMcToBinaural(
         {
             return error;
         }
+
         IF( hCrend->hReverb != NULL )
         {
             exp = sub( exp, 2 );
@@ -6948,9 +6957,13 @@ static ivas_error renderMcToBinauralRoom(
 
         /* call CREND */
 #ifdef SPLIT_REND_WITH_HEAD_ROT
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer, p_tmpRendBuffer, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
+#else
         IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, p_tmpRendBuffer, *mcInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &outAudio, *mcInput->base.ctx.pOutSampleRate ), 0 ) ),
                    IVAS_ERR_OK ) )
+#endif
 #else
         IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, p_tmpRendBuffer, *mcInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &outAudio, *mcInput->base.ctx.pOutSampleRate ) ) ),
@@ -6959,6 +6972,7 @@ static ivas_error renderMcToBinauralRoom(
         {
             return error;
         }
+
         IF( hCrend->hReverb != NULL )
         {
             exp = sub( exp, Q2 );
@@ -7079,11 +7093,16 @@ static ivas_error renderMcCustomLsToBinauralRoom(
 #else
     hCrend = mcInput->crendWrapper->hCrend;
 #endif
+
     /* call CREND */
 #ifdef SPLIT_REND_WITH_HEAD_ROT
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, p_tmpCrendBuffer, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
+#else
     IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig, NULL, NULL, NULL, NULL,
                                                  p_tmpCrendBuffer, *mcInput->base.ctx.pOutSampleRate, getNumSubframesInBuffer( &outAudio, *mcInput->base.ctx.pOutSampleRate ), 0 ) ),
                IVAS_ERR_OK ) )
+#endif
 #else
     IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig, NULL, NULL, NULL, NULL,
                                                  p_tmpCrendBuffer, *mcInput->base.ctx.pOutSampleRate, getNumSubframesInBuffer( &outAudio, *mcInput->base.ctx.pOutSampleRate ) ) ),
@@ -7092,6 +7111,7 @@ static ivas_error renderMcCustomLsToBinauralRoom(
     {
         return error;
     }
+
     IF( hCrend->hReverb != NULL )
     {
         exp = sub( exp, 2 );
@@ -7338,9 +7358,16 @@ static ivas_error renderMcToSplitBinaural(
             copyBufferTo2dArray_fx( tmpRotBuffer, tmpRendBuffer );
 
             /* call CREND (rotation already performed) */
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+            IF( NE_32( ( error = ivas_rend_crendProcessSubframe( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpRendBuffer, p_tmpRendBuffer, mcInput->base.inputBuffer.config.numSamplesPerChannel, *mcInput->base.ctx.pOutSampleRate, pos_idx ) ), IVAS_ERR_OK ) )
+#else
             IF( NE_32( ( error = ivas_rend_crendProcess( mcInput->crendWrapper, mcInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL,
                                                          p_tmpRendBuffer, *mcInput->base.ctx.pOutSampleRate, getNumSubframesInBuffer( &tmpRotBuffer, *mcInput->base.ctx.pOutSampleRate ), pos_idx ) ),
                        IVAS_ERR_OK ) )
+#endif
+            {
+                return error;
+            }
 
             IF( EQ_16( pos_idx, 0 ) )
             {
@@ -7611,9 +7638,13 @@ static ivas_error renderSbaToMultiBinaural(
         assert( sbaInput->crendWrapper->hCrend[0]->hReverb == NULL );
 
         /* call CREND */
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        IF( NE_32( ( error = ivas_rend_crendProcessSubframe( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, p_tmpCrendBuffer, sbaInput->base.inputBuffer.config.numSamplesPerChannel, *sbaInput->base.ctx.pOutSampleRate, pos_idx ) ), IVAS_ERR_OK ) )
+#else
         IF( NE_32( ( error = ivas_rend_crendProcess( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, *sbaInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &tmpRotBuffer, *sbaInput->base.ctx.pOutSampleRate ), pos_idx ) ),
                    IVAS_ERR_OK ) )
+#endif
         {
             return error;
         }
@@ -7803,9 +7834,13 @@ static ivas_error renderSbaToBinaural(
 
         /* call CREND */
 #ifdef SPLIT_REND_WITH_HEAD_ROT
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+        IF( NE_32( ( error = ivas_rend_crendProcessSubframe( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, NULL, output_fx, output_fx, sbaInput->base.inputBuffer.config.numSamplesPerChannel, *sbaInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
+#else
         IF( NE_32( ( error = ivas_rend_crendProcess( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, output_fx, *sbaInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &outAudio, *sbaInput->base.ctx.pOutSampleRate ), 0 ) ),
                    IVAS_ERR_OK ) )
+#endif
 #else
         IF( NE_32( ( error = ivas_rend_crendProcess( sbaInput->crendWrapper, sbaInput->base.inConfig, outConfig, NULL, NULL, NULL, NULL, output_fx, *sbaInput->base.ctx.pOutSampleRate,
                                                      getNumSubframesInBuffer( &outAudio, *sbaInput->base.ctx.pOutSampleRate ) ) ),
@@ -7814,6 +7849,7 @@ static ivas_error renderSbaToBinaural(
         {
             return error;
         }
+
         IF( hCrend->hReverb != NULL )
         {
             *outAudio.pq_fact = sub( *outAudio.pq_fact, Q2 );
@@ -7935,10 +7971,14 @@ static ivas_error renderSbaToBinauralRoom(
 
     /* call CREND */
 #ifdef SPLIT_REND_WITH_HEAD_ROT
+#ifdef FIX_911_REMOVE_CREND_DUPLICATION
+    IF( NE_32( ( error = ivas_rend_crendProcessSubframe( sbaInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig, NULL, NULL, NULL, NULL, NULL, p_tmpCrendBuffer, p_tmpCrendBuffer, sbaInput->base.inputBuffer.config.numSamplesPerChannel, *sbaInput->base.ctx.pOutSampleRate, 0 ) ), IVAS_ERR_OK ) )
+#else
     IF( NE_32( ( error = ivas_rend_crendProcess( sbaInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig,
                                                  NULL, NULL, NULL, NULL, p_tmpCrendBuffer, *sbaInput->base.ctx.pOutSampleRate,
                                                  getNumSubframesInBuffer( &outAudio, *sbaInput->base.ctx.pOutSampleRate ), 0 ) ),
                IVAS_ERR_OK ) )
+#endif
 #else
     IF( NE_32( ( error = ivas_rend_crendProcess( sbaInput->crendWrapper, IVAS_AUDIO_CONFIG_7_1_4, outConfig,
                                                  NULL, NULL, NULL, NULL, p_tmpCrendBuffer, *sbaInput->base.ctx.pOutSampleRate,
@@ -7948,6 +7988,7 @@ static ivas_error renderSbaToBinauralRoom(
     {
         return error;
     }
+
     IF( hCrend->hReverb != NULL )
     {
         *outAudio.pq_fact = sub( *outAudio.pq_fact, 2 );