diff --git a/VstHost_VisualC++/modules/AudioProcessing/source/WaveProcessingPipeline.cpp b/VstHost_VisualC++/modules/AudioProcessing/source/WaveProcessingPipeline.cpp
index 80ca1b5..465826d 100644
--- a/VstHost_VisualC++/modules/AudioProcessing/source/WaveProcessingPipeline.cpp
+++ b/VstHost_VisualC++/modules/AudioProcessing/source/WaveProcessingPipeline.cpp
@@ -55,6 +55,7 @@ int WaveProcessingPipeline::CreatePreprocessingModules()
 
 int WaveProcessingPipeline::PreprocessingProcessing()
 {
+    LOG(INFO) << "Prepocessing in progress..";
     int status = preprocessing_filter_wrapper_->Process(input_wave_->data, output_wave_->data);
     RETURN_ERROR_IF_NOT_SUCCESS_OR_BYPASS(status);
     if (status == VST_ERROR_STATUS::SUCCESS)
@@ -62,6 +63,7 @@ int WaveProcessingPipeline::PreprocessingProcessing()
         status = SwapInOutBuffers();
         RETURN_ERROR_IF_NOT_SUCCESS(status);
     }
+    LOG(INFO) << "Prepocessing finished.";
     return status;
 }
 
@@ -75,7 +77,10 @@ int WaveProcessingPipeline::CreatePostprocessingModules()
 
 int WaveProcessingPipeline::PostprocessingProcessing()
 {
-    return postprocessing_filter_wrapper_->Process(input_wave_->data, output_wave_->data);
+    LOG(INFO) << "Postpocessing in progress..";
+    int status = postprocessing_filter_wrapper_->Process(input_wave_->data, output_wave_->data);
+    LOG(INFO) << "Postpocessing finished.";
+    return status;
 }
 
 int WaveProcessingPipeline::GetConfig()
diff --git a/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_and_post_proc_both.wav b/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_and_post_proc_both.wav
new file mode 100644
index 0000000..652681d
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diff --git a/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_and_post_proc_only.wav b/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_and_post_proc_only.wav
new file mode 100644
index 0000000..4154ef3
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diff --git a/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_post_vst_host.wav b/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_post_vst_host.wav
new file mode 100644
index 0000000..023b6e4
Binary files /dev/null and b/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_post_vst_host.wav differ
diff --git a/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_vst_host.wav b/VstHost_VisualC++/modules/UnitTests/data/sine_440_filtrated_pre_vst_host.wav
new file mode 100644
index 0000000..3a7081b
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diff --git a/VstHost_VisualC++/modules/UnitTests/header/UnitTestsCommon.h b/VstHost_VisualC++/modules/UnitTests/header/UnitTestsCommon.h
index b77d5cd..de978a3 100644
--- a/VstHost_VisualC++/modules/UnitTests/header/UnitTestsCommon.h
+++ b/VstHost_VisualC++/modules/UnitTests/header/UnitTestsCommon.h
@@ -22,7 +22,10 @@ const std::string REF_OUTPUT_WITH_TWO_PLUGINS_2     = UT_DATA_FOLDER + "sine_440
 const std::string PROCESSING_CONFIG_PATH            = UT_DATA_FOLDER + "processing_config.json";
 const std::string PLUGIN_NAME                       = "plugin_1";
 const std::string REF_FILTRATED                     = UT_DATA_FOLDER + "sine_440_filtrated.wav";
-const std::string REF_PRE_POST_PROC                 = UT_DATA_FOLDER + "sine_440_filtrated_pre_and_post_proc.wav";
+const std::string REF_PRE_POST_PROC_ONLY            = UT_DATA_FOLDER + "sine_440_filtrated_pre_and_post_proc_only.wav";
+const std::string REF_PRE_POST_PROC_BOTH            = UT_DATA_FOLDER + "sine_440_filtrated_pre_and_post_proc_both.wav";
+const std::string REF_PRE_POST_VST_HOST             = UT_DATA_FOLDER + "sine_440_filtrated_pre_post_vst_host.wav";
+const std::string REF_PRE_VST_HOST                  = UT_DATA_FOLDER + "sine_440_filtrated_pre_vst_host.wav";
 
 const float PRECISION_9_DECIMAL_PLACES              = 1e-9;
 const float PRECISION_8_DECIMAL_PLACES              = 1e-8;
diff --git a/VstHost_VisualC++/modules/UnitTests/src/VstHostToolUnitTests.cpp b/VstHost_VisualC++/modules/UnitTests/src/VstHostToolUnitTests.cpp
index debc14b..33e7926 100644
--- a/VstHost_VisualC++/modules/UnitTests/src/VstHostToolUnitTests.cpp
+++ b/VstHost_VisualC++/modules/UnitTests/src/VstHostToolUnitTests.cpp
@@ -33,10 +33,10 @@ namespace VstHostToolUnitTest
 
         void CleanUpUtProducts()
         {
-         /*   if (std::filesystem::exists(OUTPUT_WAVE_PATH))
+            if (std::filesystem::exists(OUTPUT_WAVE_PATH))
             {
                 std::remove(OUTPUT_WAVE_PATH.c_str());
-            }*/
+            }
 
             if (std::filesystem::exists(DUMP_JSON_FILE_PATH))
             {
@@ -124,7 +124,7 @@ namespace VstHostToolUnitTest
             return status;
         }
 
-        void AppProcessingWithOutputValidation(std::string ref_path, bool validate_for_macos=true, bool bit_exact=true)
+        void AppProcessingWithOutputValidation(std::string ref_path, bool validate_quality=true, bool bit_exact=true)
         {
             std::vector<std::string> arg_params = {
                 "OfflineToolsUnitTests.exe",
@@ -146,7 +146,7 @@ namespace VstHostToolUnitTest
             std::vector<float> ref;
             status = LoadWave(ref_path, &ref);
             EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
-            if (validate_for_macos)
+            if (validate_quality)
             {
                 if (bit_exact)
                 {
@@ -407,8 +407,8 @@ namespace VstHostToolUnitTest
 
         status = JsonUtils::DumpJson(json_config, PROCESSING_CONFIG_PATH);
         EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
-#ifndef __APPLE__
-        AppProcessingWithOutputValidation(REF_PRE_POST_PROC, true, false);
+#ifdef _WIN32 
+        AppProcessingWithOutputValidation(REF_PRE_POST_PROC_ONLY, true, false);
 #else
         AppProcessingWithOutputValidation(REF_PRE_POST_PROC, false);
 #endif //!__APPLE__
@@ -424,17 +424,85 @@ namespace VstHostToolUnitTest
 
         status = JsonUtils::DumpJson(json_config, PROCESSING_CONFIG_PATH);
         EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
-#ifndef __APPLE__
-        AppProcessingWithOutputValidation(REF_PRE_POST_PROC, true, false);
+#ifdef _WIN32 
+        AppProcessingWithOutputValidation(REF_PRE_POST_PROC_ONLY, true, false);
 #else
         AppProcessingWithOutputValidation(REF_PRE_POST_PROC, false);
-#endif //!__APPLE__
+#endif //_WIN32 
+    }
+
+    TEST_F(VstHostToolTest, RunToolWithPreAndPostprocessing)
+    {
+        nlohmann::json json_config;
+        int status = FirstConfigPreparations(&json_config, false);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+        json_config[PREPROCESSING_STRING]["filter"]["enable"] = true;
+        json_config[POSTPROCESSING_STRING]["filter"]["enable"] = true;
+
+        status = JsonUtils::DumpJson(json_config, PROCESSING_CONFIG_PATH);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+#ifdef _WIN32 
+        AppProcessingWithOutputValidation(REF_PRE_POST_PROC_BOTH, true, false);
+#else
+        AppProcessingWithOutputValidation(REF_PRE_POST_PROC_BOTH, false);
+#endif //_WIN32 
+    }
+
+    TEST_F(VstHostToolTest, RunToolWithPrePostVstHostProcessing)
+    {
+        nlohmann::json json_config;
+        bool enable_vst_host = true;
+        std::string ref_file = REF_PRE_POST_VST_HOST;
+        int status = FirstConfigPreparations(&json_config, enable_vst_host);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+        json_config[PREPROCESSING_STRING]["filter"]["enable"] = true;
+        json_config[POSTPROCESSING_STRING]["filter"]["enable"] = true;
+
+        status = JsonUtils::DumpJson(json_config, PROCESSING_CONFIG_PATH);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+#ifdef _WIN32 
+        AppProcessingWithOutputValidation(ref_file, true, false);
+#else
+        AppProcessingWithOutputValidation(ref_file, false);
+#endif //_WIN32 
+    }
+
+    TEST_F(VstHostToolTest, RunToolWithPreVstHostProcessing)
+    {
+        nlohmann::json json_config;
+        bool enable_vst_host = true;
+        std::string ref_file = REF_PRE_VST_HOST;
+        int status = FirstConfigPreparations(&json_config, enable_vst_host);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+        json_config[PREPROCESSING_STRING]["filter"]["enable"] = true;
+        json_config[POSTPROCESSING_STRING]["filter"]["enable"] = false;
+
+        status = JsonUtils::DumpJson(json_config, PROCESSING_CONFIG_PATH);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+#ifdef _WIN32 
+        AppProcessingWithOutputValidation(ref_file, true, false);
+#else
+        AppProcessingWithOutputValidation(ref_file, false);
+#endif //_WIN32 
+    }
+
+    TEST_F(VstHostToolTest, RunToolWithPostVstHostProcessing)
+    {
+        nlohmann::json json_config;
+        bool enable_vst_host = true;
+        std::string ref_file = REF_PRE_VST_HOST;
+        int status = FirstConfigPreparations(&json_config, enable_vst_host);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+        json_config[PREPROCESSING_STRING]["filter"]["enable"] = false;
+        json_config[POSTPROCESSING_STRING]["filter"]["enable"] = true;
+
+        status = JsonUtils::DumpJson(json_config, PROCESSING_CONFIG_PATH);
+        EXPECT_EQ(status, VST_ERROR_STATUS::SUCCESS);
+#ifdef _WIN32 
+        AppProcessingWithOutputValidation(ref_file, true, false);
+#else
+        AppProcessingWithOutputValidation(ref_file, false);
+#endif //_WIN32 
     }
 
-// TODO:
-// Prepare reference for each test RunToolWithPreprocessingOnly
-// also for RunToolWithPostprocessingOnly and 
-// Add test for pre and post processing
-// Add test for preprocessing + vst_host
-// Add test for postprocessing + vst_host
 }