diff --git a/lib_com/options.h b/lib_com/options.h
index 10149a1c8a0f52bd2514fc9dc347817c6df120b8..c71be15d676c5ac0e01b37da5efde6895540429a 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -185,6 +185,7 @@
 #define NONBE_FIX_984_OMASA_EXT_OUTPUT                  /* Nok: issue 1497 - porting OMASA EXT MR   */
 #define NONBE_FIX_1028_1DB_TCX_LEVEL_DROP               /* VA: Harmonize the logic setting LP weighting factor between TCX encoder and TCX decoder */
 #define CONF_DISTATT                                    /* Eri: Make distance attenuation configurable */
+#define FIX_1052_EXT_OUTPUT                             /* VA: issue 1052: define EXT decoder output configuration for stereo and MC formats */ 
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_init_dec.c b/lib_dec/ivas_init_dec.c
index a03acffe1dd20b30d10daf7377c45fe75ffd3320..c7df954dbc461bb37da1e889df151e97725e0761 100644
--- a/lib_dec/ivas_init_dec.c
+++ b/lib_dec/ivas_init_dec.c
@@ -1086,7 +1086,19 @@ ivas_error ivas_init_decoder(
 
     if ( output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
     {
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( st_ivas->ivas_format == STEREO_FORMAT )
+        {
+            hDecoderConfig->nchan_out = CPE_CHANNELS;
+        }
+        else if ( st_ivas->ivas_format == MC_FORMAT )
+        {
+            hDecoderConfig->nchan_out = audioCfg2channels( st_ivas->transport_config );
+        }
+        else if ( st_ivas->ivas_format == SBA_ISM_FORMAT )
+#else
         if ( st_ivas->ivas_format == SBA_ISM_FORMAT )
+#endif
         {
             hDecoderConfig->nchan_out = audioCfg2channels( IVAS_AUDIO_CONFIG_HOA3 );
             hDecoderConfig->nchan_out += st_ivas->nchan_ism;
@@ -1113,7 +1125,19 @@ ivas_error ivas_init_decoder(
 
     st_ivas->intern_config = output_config;
 
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( output_config == IVAS_AUDIO_CONFIG_EXTERNAL && st_ivas->ivas_format == MC_FORMAT )
+    {
+        ivas_output_init( &( st_ivas->hOutSetup ), st_ivas->transport_config );
+        st_ivas->intern_config = st_ivas->transport_config;
+    }
+    else
+    {
+        ivas_output_init( &( st_ivas->hOutSetup ), output_config );
+    }
+#else
     ivas_output_init( &( st_ivas->hOutSetup ), output_config );
+#endif
 
     if ( st_ivas->ivas_format == SBA_ISM_FORMAT && output_config == IVAS_AUDIO_CONFIG_BINAURAL_ROOM_IR )
     {
@@ -2996,11 +3020,18 @@ static ivas_error doSanityChecks_IVAS(
     /* Verify stereo output configuration */
     if ( st_ivas->ivas_format == STEREO_FORMAT )
     {
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( output_config != IVAS_AUDIO_CONFIG_MONO && output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_5_1 && output_config != IVAS_AUDIO_CONFIG_7_1 && output_config != IVAS_AUDIO_CONFIG_5_1_2 && output_config != IVAS_AUDIO_CONFIG_5_1_4 && output_config != IVAS_AUDIO_CONFIG_7_1_4 && output_config != IVAS_AUDIO_CONFIG_LS_CUSTOM && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         if ( output_config != IVAS_AUDIO_CONFIG_MONO && output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_5_1 && output_config != IVAS_AUDIO_CONFIG_7_1 && output_config != IVAS_AUDIO_CONFIG_5_1_2 && output_config != IVAS_AUDIO_CONFIG_5_1_4 && output_config != IVAS_AUDIO_CONFIG_7_1_4 && output_config != IVAS_AUDIO_CONFIG_LS_CUSTOM )
+#endif
         {
             return IVAS_ERROR( IVAS_ERR_INVALID_OUTPUT_FORMAT, "Wrong output configuration specified for Stereo!" );
         }
     }
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( output_config != IVAS_AUDIO_CONFIG_MONO && output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_5_1 && output_config != IVAS_AUDIO_CONFIG_7_1 && output_config != IVAS_AUDIO_CONFIG_5_1_2 && output_config != IVAS_AUDIO_CONFIG_5_1_4 && output_config != IVAS_AUDIO_CONFIG_7_1_4 && output_config != IVAS_AUDIO_CONFIG_LS_CUSTOM && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
     else if ( st_ivas->ivas_format == ISM_FORMAT )
     {
         /* Verify ISM output configuration */
@@ -3032,11 +3063,12 @@ static ivas_error doSanityChecks_IVAS(
             return IVAS_ERROR( IVAS_ERR_INVALID_OUTPUT_FORMAT, "Incorrect output configuration specified for Multi-channel" );
         }
     }
+#endif
 
-    if ( ( output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_CODED || output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_PCM ) && output_Fs != 48000 )
-    {
-        return IVAS_ERROR( IVAS_ERR_INVALID_SAMPLING_RATE, "Error: Only 48kHz output sampling rate is supported for split rendering." );
-    }
+        if ( ( output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_CODED || output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_PCM ) && output_Fs != 48000 )
+        {
+            return IVAS_ERROR( IVAS_ERR_INVALID_SAMPLING_RATE, "Error: Only 48kHz output sampling rate is supported for split rendering." );
+        }
 
     if ( st_ivas->hDecoderConfig->Opt_Headrotation )
     {
diff --git a/lib_dec/ivas_jbm_dec.c b/lib_dec/ivas_jbm_dec.c
index 4a7d76917bd65815d94093ea49e4758792ab447b..2577f324cf5bf4b35c56d8d135c26e989d56569f 100644
--- a/lib_dec/ivas_jbm_dec.c
+++ b/lib_dec/ivas_jbm_dec.c
@@ -691,7 +691,11 @@ ivas_error ivas_jbm_dec_tc(
                 /* Delay the separated channel to sync with CLDFB delay of the DirAC synthesis, and synthesize the LFE signal. */
                 if ( output_config == IVAS_AUDIO_CONFIG_5_1 || output_config == IVAS_AUDIO_CONFIG_7_1 ||
                      output_config == IVAS_AUDIO_CONFIG_5_1_4 || output_config == IVAS_AUDIO_CONFIG_7_1_4 ||
+#ifdef FIX_1052_EXT_OUTPUT
+                     output_config == IVAS_AUDIO_CONFIG_5_1_2 || ( output_config == IVAS_AUDIO_CONFIG_LS_CUSTOM && st_ivas->hOutSetup.num_lfe > 0 ) || output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
                      output_config == IVAS_AUDIO_CONFIG_5_1_2 || ( output_config == IVAS_AUDIO_CONFIG_LS_CUSTOM && st_ivas->hOutSetup.num_lfe > 0 ) )
+#endif
                 {
                     ivas_lfe_synth_with_filters( st_ivas->hMasa->hMasaLfeSynth, p_output, output_frame, n, LFE_CHANNEL );
                 }
diff --git a/lib_dec/ivas_masa_dec.c b/lib_dec/ivas_masa_dec.c
index 722edf53e88c29e78bf23fde29da903353eed474..156a8ce77d589d2e28430bf12a56a28b1e1222cf 100644
--- a/lib_dec/ivas_masa_dec.c
+++ b/lib_dec/ivas_masa_dec.c
@@ -415,7 +415,11 @@ ivas_error ivas_masa_decode(
 
         hMasa->config.coherencePresent = !hQMetaData->all_coherence_zero;
 
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL && ( st_ivas->ivas_format == MASA_FORMAT || st_ivas->ivas_format == MASA_ISM_FORMAT ) )
+#else
         if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#endif
         {
             index_16bits( hQMetaData, hMasa->data.sph_grid16 );
         }
@@ -638,7 +642,11 @@ ivas_error ivas_masa_dec_open(
     hMasa->config.joinedSubframes = FALSE;
 
     /* Create spherical grid only for external output */
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL && ( st_ivas->ivas_format == MASA_FORMAT || st_ivas->ivas_format == MASA_ISM_FORMAT ) )
+#else
     if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#endif
     {
         if ( ( hMasa->data.sph_grid16 = (SPHERICAL_GRID_DATA *) malloc( sizeof( SPHERICAL_GRID_DATA ) ) ) == NULL )
         {
@@ -1071,6 +1079,9 @@ static ivas_error init_lfe_synth_data(
          ( output_config == IVAS_AUDIO_CONFIG_5_1 || output_config == IVAS_AUDIO_CONFIG_7_1 ||
            output_config == IVAS_AUDIO_CONFIG_5_1_2 ||
            output_config == IVAS_AUDIO_CONFIG_5_1_4 || output_config == IVAS_AUDIO_CONFIG_7_1_4 ||
+#ifdef FIX_1052_EXT_OUTPUT
+           output_config == IVAS_AUDIO_CONFIG_EXTERNAL ||
+#endif
            output_config == IVAS_AUDIO_CONFIG_FOA || output_config == IVAS_AUDIO_CONFIG_HOA2 ||
            output_config == IVAS_AUDIO_CONFIG_HOA3 ||
            ( output_config == IVAS_AUDIO_CONFIG_LS_CUSTOM && st_ivas->hOutSetup.num_lfe > 0 ) ) )
diff --git a/lib_dec/ivas_mc_param_dec.c b/lib_dec/ivas_mc_param_dec.c
index a2cf2351a21cf3803e391f36459f9adb07cef7d0..3cd98b9ca2264f33548b7f66a08beae9b79c9d94 100644
--- a/lib_dec/ivas_mc_param_dec.c
+++ b/lib_dec/ivas_mc_param_dec.c
@@ -148,7 +148,11 @@ ivas_error ivas_param_mc_dec_open(
     hParamMC->hoa_encoder = NULL;
 
     /* determine the synthesis config */
+#ifdef FIX_1052_EXT_OUTPUT
+    if ( st_ivas->renderer_type == RENDERER_SBA_LINEAR_ENC || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM || st_ivas->renderer_type == RENDERER_BINAURAL_OBJECTS_TD || st_ivas->transport_config == output_config || output_config == IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
     if ( st_ivas->renderer_type == RENDERER_SBA_LINEAR_ENC || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV || st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM || st_ivas->renderer_type == RENDERER_BINAURAL_OBJECTS_TD || st_ivas->transport_config == output_config )
+#endif
     {
         hParamMC->synthesis_conf = PARAM_MC_SYNTH_DIRECT;
     }
diff --git a/lib_dec/ivas_mct_dec.c b/lib_dec/ivas_mct_dec.c
index 40cb9e49623babbeb114d27ed613b92c8b751ab5..e337f32f42537c1ce7ffda34ca3550b3f2925204 100644
--- a/lib_dec/ivas_mct_dec.c
+++ b/lib_dec/ivas_mct_dec.c
@@ -685,6 +685,15 @@ ivas_error ivas_mc_dec_config(
         {
             st_ivas->transport_config = signaled_config;
         }
+#ifdef FIX_1052_EXT_OUTPUT
+        else if ( st_ivas->transport_config != signaled_config )
+        {
+#ifdef DEBUGGING
+            fprintf( stderr, "\nError: Switching of MC configurations is not supported!\n" );
+#endif
+            return IVAS_ERROR( IVAS_ERR_INTERNAL_FATAL, "wrong MC configuration signalled!" );
+        }
+#endif
 
         /* select MC format mode */
         st_ivas->mc_mode = ivas_mc_mode_select( ivas_mc_map_output_config_to_mc_ls_setup( signaled_config ), st_ivas->hDecoderConfig->ivas_total_brate );
@@ -692,7 +701,11 @@ ivas_error ivas_mc_dec_config(
         /* MC format switching */
         if ( st_ivas->ini_frame != 0 )
         {
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( st_ivas->hDecoderConfig->last_ivas_total_brate != st_ivas->hDecoderConfig->ivas_total_brate || last_mc_mode != st_ivas->mc_mode )
+#else
             if ( st_ivas->hDecoderConfig->last_ivas_total_brate != st_ivas->hDecoderConfig->ivas_total_brate || st_ivas->transport_config != signaled_config || last_mc_mode != st_ivas->mc_mode )
+#endif
             {
                 if ( ( error = ivas_mc_dec_reconfig( st_ivas, nSamplesRendered, pcm_resolution, data ) ) != IVAS_ERR_OK )
 
diff --git a/lib_dec/ivas_out_setup_conversion.c b/lib_dec/ivas_out_setup_conversion.c
index 699343c1da5f80a7bd03e883f9f31dc7b4a9d404..ce0172a869f7466f250b2ea302c3a5e4c3cbb1b7 100644
--- a/lib_dec/ivas_out_setup_conversion.c
+++ b/lib_dec/ivas_out_setup_conversion.c
@@ -223,9 +223,6 @@ static ivas_error get_ls_conversion_matrix(
     int16_t index;
     float value;
     const LS_CONVERSION_MATRIX *conversion_matrix;
-    ivas_error error;
-
-    error = IVAS_ERR_OK;
 
     conversion_matrix = NULL;
 
@@ -260,7 +257,7 @@ static ivas_error get_ls_conversion_matrix(
                         }
                     }
                 }
-                return error;
+                return IVAS_ERR_OK;
             }
             else
             {
@@ -273,7 +270,7 @@ static ivas_error get_ls_conversion_matrix(
                     {
                         hLsSetUpConversion->dmxMtx[k][k] = 1.0f;
                     }
-                    return error;
+                    return IVAS_ERR_OK;
                 }
                 else
                 {
@@ -288,7 +285,7 @@ static ivas_error get_ls_conversion_matrix(
                         hLsSetUpConversion->dmxMtx[ch_in][ch_out] = value;
                     }
                 }
-                return error;
+                return IVAS_ERR_OK;
             }
         }
     }
@@ -311,8 +308,10 @@ ivas_error ivas_ls_setup_conversion_open(
     int16_t chIdx, inChannels, outChannels;
     int16_t output_frame;
     int32_t output_Fs;
-    int16_t nchan_out;
     int16_t paramUpmixMonoStereo;
+#ifdef FIX_1052_EXT_OUTPUT
+    ivas_error error;
+#endif
 
     if ( st_ivas->ivas_format == MC_FORMAT && st_ivas->mc_mode == MC_MODE_PARAMUPMIX && ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_MONO || st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_STEREO ) )
     {
@@ -323,7 +322,7 @@ ivas_error ivas_ls_setup_conversion_open(
         paramUpmixMonoStereo = FALSE;
     }
     output_Fs = st_ivas->hDecoderConfig->output_Fs;
-    nchan_out = st_ivas->hDecoderConfig->nchan_out;
+    outChannels = st_ivas->hDecoderConfig->nchan_out;
     output_frame = (int16_t) ( output_Fs / FRAMES_PER_SEC );
 
     /* Allocate memory to the handle */
@@ -332,9 +331,8 @@ ivas_error ivas_ls_setup_conversion_open(
         return ( IVAS_ERROR( IVAS_ERR_FAILED_ALLOC, "Can not allocate memory for LS configuration Conversion Handle \n" ) );
     }
 
-    assert( nchan_out <= MAX_OUTPUT_CHANNELS );
+    assert( outChannels <= MAX_OUTPUT_CHANNELS );
 
-    outChannels = nchan_out;
     if ( st_ivas->renderer_type == RENDERER_MC_PARAMMC )
     {
         inChannels = st_ivas->hTransSetup.nchan_out_woLFE + st_ivas->hTransSetup.num_lfe;
@@ -423,16 +421,37 @@ ivas_error ivas_ls_setup_conversion_open(
         {
             if ( paramUpmixMonoStereo == TRUE )
             {
+#ifdef FIX_1052_EXT_OUTPUT
+                if ( ( error = get_ls_conversion_matrix( hLsSetUpConversion, IVAS_AUDIO_CONFIG_5_1_2, st_ivas->hDecoderConfig->output_config ) ) != IVAS_ERR_OK )
+                {
+                    return error;
+                }
+#else
                 get_ls_conversion_matrix( hLsSetUpConversion, IVAS_AUDIO_CONFIG_5_1_2, st_ivas->hDecoderConfig->output_config );
+#endif
             }
             else
             {
+#ifdef FIX_1052_EXT_OUTPUT
+                if ( ( error = get_ls_conversion_matrix( hLsSetUpConversion, st_ivas->transport_config, st_ivas->hDecoderConfig->output_config ) ) != IVAS_ERR_OK )
+                {
+                    return error;
+                }
+#else
                 get_ls_conversion_matrix( hLsSetUpConversion, st_ivas->transport_config, st_ivas->hDecoderConfig->output_config );
+#endif
             }
         }
         else
         {
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( ( error = get_ls_conversion_matrix( hLsSetUpConversion, st_ivas->intern_config, st_ivas->hDecoderConfig->output_config ) ) != IVAS_ERR_OK )
+            {
+                return error;
+            }
+#else
             get_ls_conversion_matrix( hLsSetUpConversion, st_ivas->intern_config, st_ivas->hDecoderConfig->output_config );
+#endif
         }
     }
 
@@ -633,9 +652,7 @@ void ivas_ls_setup_conversion_process_mdct(
         {
             dmxCoeff = hLsSetUpConversion->dmxMtx[chInIdx][chOutIdx];
 
-            if (
-                chInIdx != LFE_CHANNEL &&
-                mct_chan_mode[chInIdx] != MCT_CHAN_MODE_IGNORE )
+            if ( chInIdx != LFE_CHANNEL && mct_chan_mode[chInIdx] != MCT_CHAN_MODE_IGNORE )
             {
                 /* Step 1: Compute the target energy and DMX signal (possible since we have all signals in TCX20 resolution) */
                 if ( dmxCoeff )
@@ -728,9 +745,7 @@ void ivas_ls_setup_conversion_process_mdct(
     /* Step 4: Perform equalization */
     for ( chInIdx = 0; chInIdx < inChannels; chInIdx++ )
     {
-        if (
-            chInIdx != LFE_CHANNEL &&
-            mct_chan_mode[chInIdx] != MCT_CHAN_MODE_IGNORE )
+        if ( chInIdx != LFE_CHANNEL && mct_chan_mode[chInIdx] != MCT_CHAN_MODE_IGNORE )
         {
             if ( transform_type[chInIdx][0] == TCX_20 )
             {
diff --git a/lib_dec/ivas_output_config.c b/lib_dec/ivas_output_config.c
index c44b59e8c93f0791b8db9148d2fbe113ec01df1e..4d7f9acfe9781338d62922d54bee70aed46455a2 100644
--- a/lib_dec/ivas_output_config.c
+++ b/lib_dec/ivas_output_config.c
@@ -262,7 +262,11 @@ void ivas_renderer_select(
     }
     else if ( st_ivas->ivas_format == STEREO_FORMAT )
     {
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_MONO && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         if ( output_config != IVAS_AUDIO_CONFIG_STEREO && output_config != IVAS_AUDIO_CONFIG_MONO )
+#endif
         {
             *renderer_type = RENDERER_MC;
         }
@@ -410,7 +414,11 @@ void ivas_renderer_select(
     else if ( st_ivas->ivas_format == MC_FORMAT )
     {
         *internal_config = transport_config;
+#ifdef FIX_1052_EXT_OUTPUT
+        if ( st_ivas->mc_mode == MC_MODE_MCT && *internal_config != output_config && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         if ( st_ivas->mc_mode == MC_MODE_MCT && *internal_config != output_config )
+#endif
         {
             if ( output_config != IVAS_AUDIO_CONFIG_FOA && output_config != IVAS_AUDIO_CONFIG_HOA2 && output_config != IVAS_AUDIO_CONFIG_HOA3 )
             {
@@ -424,7 +432,11 @@ void ivas_renderer_select(
         else if ( st_ivas->mc_mode == MC_MODE_PARAMUPMIX )
         {
             *internal_config = transport_config;
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( *internal_config != output_config && output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
             if ( *internal_config != output_config )
+#endif
             {
                 if ( output_config != IVAS_AUDIO_CONFIG_FOA && output_config != IVAS_AUDIO_CONFIG_HOA2 && output_config != IVAS_AUDIO_CONFIG_HOA3 )
                 {
@@ -449,7 +461,14 @@ void ivas_renderer_select(
         }
         else if ( st_ivas->mc_mode == MC_MODE_MCMASA )
         {
+#ifdef FIX_1052_EXT_OUTPUT
+            if ( output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+            {
+                *internal_config = output_config;
+            }
+#else
             *internal_config = output_config;
+#endif
 
             /* No rendering for 1TC to Mono or Stereo and 2TC to Stereo */
             if ( output_config == IVAS_AUDIO_CONFIG_MONO || output_config == IVAS_AUDIO_CONFIG_STEREO )
diff --git a/lib_rend/ivas_output_init.c b/lib_rend/ivas_output_init.c
index 39ff3d95bc0ca92503f0b217d91ba73717c23db6..87df5d6df5a630039e1d9180961eefd9de69604d 100644
--- a/lib_rend/ivas_output_init.c
+++ b/lib_rend/ivas_output_init.c
@@ -402,7 +402,11 @@ int16_t ivas_get_nchan_buffers_dec(
         {
             nchan_out_buff = max( nchan_out_buff, st_ivas->hOutSetup.nchan_out_woLFE + st_ivas->hOutSetup.num_lfe );
         }
+#ifdef FIX_1052_EXT_OUTPUT
+        else if ( output_config != IVAS_AUDIO_CONFIG_EXTERNAL )
+#else
         else
+#endif
         {
             nchan_out_buff = max( audioCfg2channels( st_ivas->transport_config ), audioCfg2channels( st_ivas->intern_config ) );
             nchan_out_buff = max( nchan_out_buff, audioCfg2channels( output_config ) );