diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index d5d9110..cd5d1d7 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -30,7 +30,17 @@ set (libSourceFiles
 			"src/implementation/CziWriterManager.cpp" 
 			"src/implementation/CziWriterManager.h" 
 			"src/functions/func_open.cpp" 
-			"src/functions/func_open.h" "src/functions/func_getsubblockbitmap.cpp" "src/functions/func_getsubblockbitmap.h")
+			"src/functions/func_open.h" 
+			"src/functions/func_getsubblockbitmap.cpp" 
+			"src/functions/func_getsubblockbitmap.h" 
+			"src/functions/func_getmultichannelscalingtilecomposite.cpp" 
+			"src/functions/func_getmultichannelscalingtilecomposite.h" 
+			"src/functions/func_getinfo.cpp" 
+			"src/functions/func_getinfo.h" 
+			"src/functions/func_getmetadataxml.cpp" 
+			"src/functions/func_getmetadataxml.h" 
+			"src/functions/func_getscaling.cpp" 
+			"src/functions/func_getscaling.h")
 
 if(CMAKE_BUILD_TYPE MATCHES Debug)
  set(lib_ENABLE_LOGGING 1)
@@ -44,7 +54,7 @@ set(lib_LOGLEVEL 1)
 set(lib_VERSION_MAJOR	${MEXCZI_MAJOR})
 set(lib_VERSION_MINOR	${MEXCZI_MINOR})
 set(lib_VERSION_PATCH	${MEXCZI_PATCH})
-set(lib_VERSION_EXT    ${MEXCZI_EXT})
+set(lib_VERSION_EXT   ${MEXCZI_EXT})
 
 configure_file (
   "${CMAKE_CURRENT_SOURCE_DIR}/lib_config.h.in"
diff --git a/lib/src/functions/func_getinfo.cpp b/lib/src/functions/func_getinfo.cpp
new file mode 100644
index 0000000..baaa6e6
--- /dev/null
+++ b/lib/src/functions/func_getinfo.cpp
@@ -0,0 +1,29 @@
+#include "func_getinfo.h"
+#include <memory>
+#include "../implementation/argsutils.h"
+#include "../implementation/utils.h"
+
+using namespace std;
+
+void MexFunction_GetInfo_CheckArguments(MatlabArgs* args)
+{
+    if (args->nrhs < 2)
+    {
+        throw invalid_argument("not enough arguments");
+    }
+
+    if (!CArgsUtils::IsNumericArrayOfMinSize(args->prhs[1], 1, args->app_functions))
+    {
+        throw invalid_argument("2nd argument must be an integer");
+    }
+}
+
+void MexFunction_GetInfo_Execute(MatlabArgs* args)
+{
+    int id;
+    bool b = CArgsUtils::TryGetInt32(args->prhs[1], &id, args->app_functions);
+    const std::shared_ptr<CziReader> reader = ::Utils::GetReaderOrThrow(id);
+
+    auto* info = reader->GetInfo(args->app_functions);
+    args->plhs[0] = info;
+}
\ No newline at end of file
diff --git a/lib/src/functions/func_getinfo.h b/lib/src/functions/func_getinfo.h
new file mode 100644
index 0000000..2c0c714
--- /dev/null
+++ b/lib/src/functions/func_getinfo.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include "../mexFunctions.h"
+
+void MexFunction_GetInfo_CheckArguments(MatlabArgs* args);
+void MexFunction_GetInfo_Execute(MatlabArgs* args);
\ No newline at end of file
diff --git a/lib/src/functions/func_getmetadataxml.cpp b/lib/src/functions/func_getmetadataxml.cpp
new file mode 100644
index 0000000..60b09d0
--- /dev/null
+++ b/lib/src/functions/func_getmetadataxml.cpp
@@ -0,0 +1,30 @@
+#include "func_getmetadataxml.h"
+#include <memory>
+#include "../implementation/argsutils.h"
+#include "../implementation/utils.h"
+
+using namespace std;
+
+// How to parse an XML-string with MATLAB -> http://undocumentedmatlab.com/articles/parsing-xml-strings
+
+void MexFunction_GetMetadataXml_CheckArguments(MatlabArgs* args)
+{
+    if (args->nrhs < 2)
+    {
+        throw invalid_argument("not enough arguments");
+    }
+
+    if (!CArgsUtils::IsNumericArrayOfMinSize(args->prhs[1], 1, args->app_functions))
+    {
+        throw invalid_argument("2nd argument must be an integer");
+    }
+}
+
+void MexFunction_GetMetadataXml_Execute(MatlabArgs* args)
+{
+    int id;
+    bool b = CArgsUtils::TryGetInt32(args->prhs[1], &id, args->app_functions);
+    std::shared_ptr<CziReader> reader = ::Utils::GetReaderOrThrow(id);
+    auto* m = reader->GetMetadataXmlAsMxArray(args->app_functions);
+    args->plhs[0] = m;
+}
diff --git a/lib/src/functions/func_getmetadataxml.h b/lib/src/functions/func_getmetadataxml.h
new file mode 100644
index 0000000..322f079
--- /dev/null
+++ b/lib/src/functions/func_getmetadataxml.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include "../mexFunctions.h"
+
+void MexFunction_GetMetadataXml_CheckArguments(MatlabArgs* args);
+void MexFunction_GetMetadataXml_Execute(MatlabArgs* args);
diff --git a/lib/src/functions/func_getmultichannelscalingtilecomposite.cpp b/lib/src/functions/func_getmultichannelscalingtilecomposite.cpp
new file mode 100644
index 0000000..3853ac5
--- /dev/null
+++ b/lib/src/functions/func_getmultichannelscalingtilecomposite.cpp
@@ -0,0 +1,68 @@
+#include "func_getmultichannelscalingtilecomposite.h"
+#include "../implementation/CziReaderManager.h"
+#include <vector>
+#include <memory>
+#include "../implementation/argsutils.h"
+#include "../implementation/utils.h"
+
+using namespace std;
+using namespace libCZI;
+
+void MexFunction_GetMultiChannelScalingTileComposite_CheckArguments(MatlabArgs* args)
+{
+    // arguments:
+    // (1)  handle
+    // (2)  ROI -> array of >=4 numbers
+    // (3)  plane-coordinate
+    // (4)  zoom (number)
+    // (5)  (optional) display-settings
+    if (args->nrhs < 5)
+    {
+        throw invalid_argument("not enough arguments");
+    }
+
+    if (!CArgsUtils::IsNumericArrayOfMinSize(args->prhs[1], 1, args->app_functions))
+    {
+        throw invalid_argument("1st argument must be an integer");
+    }
+
+    if (!CArgsUtils::IsNumericArrayOfMinSize(args->prhs[2], 4, args->app_functions))
+    {
+        throw invalid_argument("2nd argument must be a ROI");
+    }
+
+    if (!CArgsUtils::TryGetDimCoordinate(args->prhs[3], nullptr, args->app_functions))
+    {
+        throw invalid_argument("3nd argument must be a string (specifying a coordinate)");
+    }
+
+    if (!CArgsUtils::TryGetSingle(args->prhs[4], nullptr, args->app_functions))
+    {
+        throw invalid_argument("4th argument must be a number");
+    }
+}
+
+void MexFunction_GetMultiChannelScalingTileComposite_Execute(MatlabArgs* args)
+{
+    int id;
+    bool b = CArgsUtils::TryGetInt32(args->prhs[1], &id, args->app_functions);
+
+    std::shared_ptr<CziReader> reader = ::Utils::GetReaderOrThrow(id);
+    IntRect rect;
+    b = CArgsUtils::TryGetIntRect(args->prhs[2], &rect, args->app_functions);
+
+    CDimCoordinate coord;
+    b = CArgsUtils::TryGetDimCoordinate(args->prhs[3], &coord, args->app_functions);
+
+    float zoom;
+    b = CArgsUtils::TryGetSingle(args->prhs[4], &zoom, args->app_functions);
+
+    auto* out = reader->GetMultiChannelScalingTileComposite(
+        rect,
+        &coord,
+        (float)zoom,
+        (const char*)nullptr/*displaySettingsString*/,
+        args->app_functions);
+
+    args->plhs[0] = out;
+}
\ No newline at end of file
diff --git a/lib/src/functions/func_getmultichannelscalingtilecomposite.h b/lib/src/functions/func_getmultichannelscalingtilecomposite.h
new file mode 100644
index 0000000..26d6e7b
--- /dev/null
+++ b/lib/src/functions/func_getmultichannelscalingtilecomposite.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include "../mexFunctions.h"
+
+void MexFunction_GetMultiChannelScalingTileComposite_CheckArguments(MatlabArgs* args);
+void MexFunction_GetMultiChannelScalingTileComposite_Execute(MatlabArgs* args);
\ No newline at end of file
diff --git a/lib/src/functions/func_getscaling.cpp b/lib/src/functions/func_getscaling.cpp
new file mode 100644
index 0000000..472c42e
--- /dev/null
+++ b/lib/src/functions/func_getscaling.cpp
@@ -0,0 +1,33 @@
+#include "func_getscaling.h"
+#include <memory>
+#include "../implementation/argsutils.h"
+#include "../implementation/utils.h"
+
+using namespace std;
+
+void MexFunction_GetScaling_CheckArguments(MatlabArgs* args)
+{
+    if (args->nrhs < 2)
+    {
+        throw invalid_argument("not enough arguments");
+    }
+
+    if (!CArgsUtils::IsNumericArrayOfMinSize(args->prhs[1], 1, args->app_functions))
+    {
+        throw invalid_argument("2nd argument must be an integer");
+    }
+}
+
+void MexFunction_GetScaling_Execute(MatlabArgs* args)
+{
+    int id;
+    const bool b = CArgsUtils::TryGetInt32(args->prhs[1], &id, args->app_functions);
+    if (!b)
+    {
+        throw invalid_argument("2nd argument must be an integer");
+    }
+
+    std::shared_ptr<CziReader> reader = ::Utils::GetReaderOrThrow(id);
+    auto* m = reader->GetScalingAsMatlabStruct(args->app_functions);
+    args->plhs[0] = m;
+}
\ No newline at end of file
diff --git a/lib/src/functions/func_getscaling.h b/lib/src/functions/func_getscaling.h
new file mode 100644
index 0000000..5734c6a
--- /dev/null
+++ b/lib/src/functions/func_getscaling.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include "../mexFunctions.h"
+
+void MexFunction_GetScaling_CheckArguments(MatlabArgs* args);
+void MexFunction_GetScaling_Execute(MatlabArgs* args);
\ No newline at end of file
diff --git a/lib/src/mexFunctions.cpp b/lib/src/mexFunctions.cpp
index d86562a..3b98498 100644
--- a/lib/src/mexFunctions.cpp
+++ b/lib/src/mexFunctions.cpp
@@ -4,12 +4,13 @@
 #include "functions/func_getversion.h"
 #include "functions/func_open.h"
 #include "functions/func_getsubblockbitmap.h"
+#include "functions/func_getmultichannelscalingtilecomposite.h"
+#include "functions/func_getinfo.h"
+#include "functions/func_getscaling.h"
+#include "functions/func_getmetadataxml.h"
 /*
 #include "src/func_close.h"
 #include "src/func_getmultichannelscalingtilecomposite.h"
-#include "src/func_getinfo.h"
-#include "src/func_getmetadataxml.h"
-#include "src/func_getscaling.h"
 #include "src/func_getsinglechannelscalingtilecomposite.h"
 #include "src/func_getdefaultdisplaysettings.h"
 #include "src/func_getsubblock.h"
@@ -23,11 +24,11 @@
     {u8"GetVersion", {MexFunction_GetVersion_CheckArguments,MexFunction_GetVersion_Execute}},
     {u8"Open", {MexFunction_Open_CheckArguments,MexFunction_Open_Execute}},
     {u8"GetSubBlockBitmap", {MexFunction_GetSubBlockBitmap_CheckArguments,MexFunction_GetSubBlockBitmap_Execute}},
-    /*
     {u8"GetMultiChannelScalingTileComposite", {MexFunction_GetMultiChannelScalingTileComposite_CheckArguments,MexFunction_GetMultiChannelScalingTileComposite_Execute}},
     {u8"GetInfo", {MexFunction_GetInfo_CheckArguments,MexFunction_GetInfo_Execute}},
     {u8"GetScaling", {MexFunction_GetScaling_CheckArguments,MexFunction_GetScaling_Execute}},
     {u8"GetMetadataXml", {MexFunction_GetMetadataXml_CheckArguments,MexFunction_GetMetadataXml_Execute}},
+    /*
     {u8"GetSingleChannelScalingTileComposite", {MexFunction_GetSingleChannelScalingTileComposite_CheckArguments,MexFunction_GetSingleChannelScalingTileComposite_Execute}},
     {u8"Close", {MexFunction_Close_CheckArguments,MexFunction_Close_Execute}},
     {u8"GetDefaultDisplaySettings", {MexFunction_GetDefaultDisplaySettings_CheckArguments,MexFunction_GetDefaultDisplaySettings_Execute}},