diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3decff49..f8edc1f2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -134,7 +134,7 @@ add_executable(sfizz_tests ${TEST_SOURCES} ${COMMON_SOURCES})
 if(UNIX)
 target_link_libraries(sfizz_tests stdc++fs)
 endif(UNIX)
-target_link_libraries(sfizz_tests Catch2::Catch2 absl::strings)
+target_link_libraries(sfizz_tests Catch2::Catch2 absl::strings absl::flat_hash_map sndfile readerwriterqueue)
 target_include_directories(sfizz_tests SYSTEM PRIVATE sources)
 file(COPY "tests" DESTINATION ${CMAKE_BINARY_DIR})
 
@@ -147,9 +147,17 @@ endif(UNIX)
 target_link_libraries(bench_fill absl::strings benchmark)
 
 ###############################
-add_executable(bench_read benchmarks/Stereo_Read_Interleaved.cpp ${COMMON_SOURCES})
+add_executable(bench_read benchmarks/Stereo_Read_Interleaved.cpp sources/StereoBufferSSE.cpp)
 # Per OS properties
 if(UNIX)
     target_link_libraries(bench_read stdc++fs)
 endif(UNIX)
 target_link_libraries(bench_read absl::strings benchmark)
+
+###############################
+add_executable(bench_write benchmarks/Stereo_Write_Interleaved.cpp sources/StereoBufferSSE.cpp)
+# Per OS properties
+if(UNIX)
+    target_link_libraries(bench_write stdc++fs)
+endif(UNIX)
+target_link_libraries(bench_write absl::strings benchmark)
diff --git a/benchmarks/Stereo_Write_Interleaved.cpp b/benchmarks/Stereo_Write_Interleaved.cpp
new file mode 100644
index 00000000..393d108c
--- /dev/null
+++ b/benchmarks/Stereo_Write_Interleaved.cpp
@@ -0,0 +1,53 @@
+#include <benchmark/benchmark.h>
+#include "../sources/StereoBuffer.h"
+#include <algorithm>
+#include <numeric>
+
+static void Interleaved_Write(benchmark::State& state) {
+  StereoBuffer<float> buffer (state.range(0));
+  std::vector<float> input (state.range(0) * 2);
+  buffer.readInterleaved(input.data(), state.range(0));
+  std::vector<float> output (state.range(0) * 2);
+  std::iota(input.begin(), input.end(), 1.0f);
+  for (auto _ : state) {
+    buffer.writeInterleaved(output.data(), state.range(0));
+  }
+}
+BENCHMARK(Interleaved_Write)->Range((8<<10) + 3, (8<<20) + 3);
+
+static void Interleaved_Write_SSE(benchmark::State& state) {
+  StereoBuffer<float> buffer (state.range(0));
+  std::vector<float> input (state.range(0) * 2);
+  buffer.readInterleaved<true>(input.data(), state.range(0));
+  std::vector<float> output (state.range(0) * 2);
+  std::iota(input.begin(), input.end(), 1.0f);
+  for (auto _ : state) {
+    buffer.writeInterleaved<true>(output.data(), state.range(0));
+  }
+}
+BENCHMARK(Interleaved_Write_SSE)->Range((8<<10) + 3, (8<<20) + 3);
+
+static void Unaligned_Interleaved_Write(benchmark::State& state) {
+  StereoBuffer<float> buffer (state.range(0));
+  std::vector<float> input (state.range(0) * 2);
+  buffer.readInterleaved(input.data(), state.range(0));
+  std::vector<float> output (state.range(0) * 2 + 1);
+  std::iota(input.begin(), input.end(), 1.0f);
+  for (auto _ : state) {
+    buffer.writeInterleaved(output.data() + 1, state.range(0));
+  }
+}
+BENCHMARK(Unaligned_Interleaved_Write)->Range((8<<10) + 3, (8<<20) + 3);
+
+static void Unaligned_Interleaved_Write_SSE(benchmark::State& state) {
+  StereoBuffer<float> buffer (state.range(0));
+  std::vector<float> input (state.range(0) * 2);
+  buffer.readInterleaved<true>(input.data(), state.range(0));
+  std::vector<float> output (state.range(0) * 2 + 1);
+  std::iota(input.begin(), input.end(), 1.0f);
+  for (auto _ : state) {
+    buffer.writeInterleaved<true>(output.data() + 1, state.range(0));
+  }
+}
+BENCHMARK(Unaligned_Interleaved_Write_SSE)->Range((8<<10) + 3, (8<<20) + 3);
+BENCHMARK_MAIN();
\ No newline at end of file
diff --git a/sources/Buffer.h b/sources/Buffer.h
index cbf80982..dbb1dcbd 100644
--- a/sources/Buffer.h
+++ b/sources/Buffer.h
@@ -33,6 +33,8 @@ public:
         normalEnd = normalData + alignedSize;
         if (auto endMisalignment = (alignedSize & TypeAlignmentMask); endMisalignment != 0)
             _alignedEnd = normalEnd + Alignment - endMisalignment;
+        else
+            _alignedEnd = normalEnd;
         return true;
     }
 
diff --git a/sources/FilePool.cpp b/sources/FilePool.cpp
index 08bd6562..3db91c98 100644
--- a/sources/FilePool.cpp
+++ b/sources/FilePool.cpp
@@ -1,4 +1,6 @@
 #include "FilePool.h"
+#include <chrono>
+using namespace std::chrono_literals;
 
 std::optional<sfz::FilePool::FileInformation> sfz::FilePool::getFileInformation(std::string_view filename)
 {
@@ -38,9 +40,11 @@ void sfz::FilePool::enqueueLoading(Voice* voice, std::string_view sample, int nu
 void sfz::FilePool::loadingThread()
 {
     FileLoadingInformation fileToLoad;
-    while (true)
+    while (!quitThread)
     {
-        loadingQueue.wait_dequeue(fileToLoad);
+        if (!loadingQueue.wait_dequeue_timed(fileToLoad, 1ms))
+            continue;
+
         if (fileToLoad.voice == nullptr)
         {
             DBG("Background thread error: voice is null.");
diff --git a/sources/FilePool.h b/sources/FilePool.h
index 04c2f373..424d2b4a 100644
--- a/sources/FilePool.h
+++ b/sources/FilePool.h
@@ -19,7 +19,13 @@ public:
     FilePool()
     : fileLoadingThread(std::thread(&FilePool::loadingThread, this))
     {
+        
+    }
 
+    ~FilePool()
+    {
+        quitThread = true;
+        fileLoadingThread.join();
     }
     void setRootDirectory(const std::filesystem::path& directory) { rootDirectory = directory; }
     size_t getNumPreloadedSamples() { return preloadedData.size(); }
@@ -45,6 +51,7 @@ private:
     moodycamel::BlockingReaderWriterQueue<FileLoadingInformation> loadingQueue;
     void loadingThread();
     std::thread fileLoadingThread;
+    bool quitThread { false };
     Buffer<float> tempReadBuffer { config::preloadSize * 2 };
     // std::map<std::string_view, std::shared_ptr<StereoBuffer<float>>> preloadedData;
     absl::flat_hash_map<std::string_view, std::shared_ptr<StereoBuffer<float>>> preloadedData;
diff --git a/sources/InterleavedStereoBuffer.h b/sources/InterleavedStereoBuffer.h
new file mode 100644
index 00000000..07c7b98b
--- /dev/null
+++ b/sources/InterleavedStereoBuffer.h
@@ -0,0 +1,48 @@
+#include "Globals.h"
+template<class Type, unsigned int Alignment = SIMDConfig::defaultAlignment>
+class InterleavedStereoBuffer
+{
+public:
+    static constexpr int numChannels { 2 };
+    InterleavedStereoBuffer() = default;
+    InterleavedStereoBuffer(int numFrames)
+    {
+        resize(numFrames);
+    }
+    
+    bool resize(int numFrames) 
+    {
+        // should have a positive number of frames...
+        ASSERT(numFrames >= 0);
+        if (buffer.resize(static_cast<size_t>(2*numFrames)))
+        {
+            this->numFrames = numFrames;
+            return true;
+        }
+        return false;
+    }
+    
+    struct Frame
+    {
+        Type left;
+        Type right;
+    };
+
+    Frame& getFrame(int frameIndex)
+    {
+        return *static_cast<Frame*>(buffer.data() + 2 * frameIndex);
+    }
+
+    int getNumFrames() const noexcept { return numFrames; }
+    int getNumChannels() const noexcept { return numChannels; }
+    bool empty() const noexcept { return numFrames == 0; }
+private:
+    static constexpr auto TypeAlignment { Alignment / sizeof(Type) };
+    static constexpr auto TypeAlignmentMask { TypeAlignment - 1 };
+    static_assert(TypeAlignment * sizeof(Type) == Alignment, "The alignment does not appear to be divided by the size of the Type");
+    int numFrames { 0 };
+    int totalSize { 0 };
+    int padding { 0 };
+    Buffer<Type, Alignment> buffer {};
+    Type trash { 0 };
+};
\ No newline at end of file
diff --git a/sources/Range.h b/sources/Range.h
index 3901a008..297cb318 100644
--- a/sources/Range.h
+++ b/sources/Range.h
@@ -67,13 +67,13 @@ private:
 template<class Type>
 bool operator==(const Range<Type>& lhs, const Range<Type>& rhs)
 {
-    return (lhs.start() == rhs.start()) && (lhs.end() == rhs.end());
+    return (lhs.getStart() == rhs.getStart()) && (lhs.getEnd() == rhs.getEnd());
 }
 
 template<class Type>
 bool operator==(const Range<Type>& lhs, const std::pair<Type, Type>& rhs)
 {
-    return (lhs.start() == rhs.first) && (lhs.end() == rhs.second);
+    return (lhs.getStart() == rhs.first) && (lhs.getEnd() == rhs.second);
 }
 
 template<class Type>
diff --git a/sources/StereoBuffer.h b/sources/StereoBuffer.h
index ed7e94f9..6aeec758 100644
--- a/sources/StereoBuffer.h
+++ b/sources/StereoBuffer.h
@@ -70,6 +70,20 @@ public:
         }
     }
 
+    template<bool useSIMD=false>
+    void writeInterleaved(Type* output, int numFrames) noexcept
+    {
+        ASSERT(numFrames <= this->numFrames);
+        auto [lIn, rIn] = getChannels();
+        auto* out = output;
+        auto* end = output + numChannels * numFrames;
+        while (out < end)
+        {
+            *out++ = *lIn++;
+            *out++ = *rIn++;
+        }
+    }
+
     Type* getChannel(Channel channel) noexcept
     {
         switch(channel)
diff --git a/sources/StereoBufferSSE.cpp b/sources/StereoBufferSSE.cpp
index d126041f..099d47c2 100644
--- a/sources/StereoBufferSSE.cpp
+++ b/sources/StereoBufferSSE.cpp
@@ -5,6 +5,7 @@ template <>
 template <>
 void StereoBuffer<float, 16>::readInterleaved<true>(float *input, int numFrames) noexcept
 {
+    // The number of frames to read has to fit!
     ASSERT(this->numFrames >= numFrames);
     const int residualFrames = numFrames & (2 * TypeAlignment - 1);
     const int lastAligned = numFrames - residualFrames;
@@ -47,6 +48,7 @@ void StereoBuffer<float, 16>::fill<true>(float value) noexcept
     const __m128 mmValue = _mm_set_ps1(value);
     auto [lBegin, rBegin] = getChannels();
     auto [lEnd, rEnd] = alignedEnds();
+    // Cast to m128 so that pointer arithmetics make sense
     auto mmLeft = reinterpret_cast<__m128*>(lBegin);
     auto mmRight = reinterpret_cast<__m128*>(rBegin);
     while (mmLeft < reinterpret_cast<__m128*>(lEnd)) // we should only need to test a single channel
@@ -56,4 +58,38 @@ void StereoBuffer<float, 16>::fill<true>(float value) noexcept
         mmLeft++;
         mmRight++;
     }
+}
+
+template<>
+template<>
+void StereoBuffer<float, 16>::writeInterleaved<true>(float* output, int numFrames) noexcept
+{
+    ASSERT(numFrames <= this->numFrames);
+    const int residualFrames = numFrames & (TypeAlignment - 1);
+    const int lastAligned = numFrames - residualFrames;
+    auto [lIn, rIn] = getChannels();
+    auto* out = output;
+    const auto* sseEnd = lIn + lastAligned;
+    while (lIn < sseEnd)
+    {
+        const auto lInRegister = _mm_load_ps(lIn);
+        const auto rInRegister = _mm_load_ps(rIn);
+        
+        const auto outRegister1 = _mm_unpacklo_ps(lInRegister, rInRegister);
+        _mm_storeu_ps(out, outRegister1);
+        out += TypeAlignment;
+        const auto outRegister2 = _mm_unpackhi_ps(lInRegister, rInRegister);
+        _mm_storeu_ps(out, outRegister2);
+        out += TypeAlignment;
+
+        lIn += TypeAlignment;
+        rIn += TypeAlignment;
+    }
+
+    const auto* end = output + numChannels * numFrames;
+    while (out < end)
+    {
+        *out++ = *lIn++;
+        *out++ = *rIn++;
+    }
 }
\ No newline at end of file
diff --git a/tests/BufferT.cpp b/tests/BufferT.cpp
index 09df03b2..5a3a22bf 100644
--- a/tests/BufferT.cpp
+++ b/tests/BufferT.cpp
@@ -32,11 +32,11 @@ TEST_CASE("[Buffer] Empty (uint8_t)")
 }
 
 template<class Type>
-void checkBoundaries(Buffer<Type>& buffer, size_t expectedSize)
+void checkBoundaries(Buffer<Type>& buffer, int expectedSize)
 {
-    REQUIRE(buffer.size() == expectedSize);
-    REQUIRE(((size_t)buffer.data() & (config::defaultAlignment - 1)) == 0);
-    REQUIRE(((size_t)buffer.alignedEnd() & (config::defaultAlignment - 1)) == 0);
+    REQUIRE((int)buffer.size() == expectedSize);
+    REQUIRE(((size_t)buffer.data() & (SIMDConfig::defaultAlignment - 1)) == 0);
+    REQUIRE(((size_t)buffer.alignedEnd() & (SIMDConfig::defaultAlignment - 1)) == 0);
     REQUIRE(std::distance(buffer.begin(), buffer.end()) == expectedSize);
     REQUIRE(std::distance(buffer.begin(), buffer.alignedEnd()) >= expectedSize);
 }
diff --git a/tests/FilesT.cpp b/tests/FilesT.cpp
index ba96e76a..50ec99db 100644
--- a/tests/FilesT.cpp
+++ b/tests/FilesT.cpp
@@ -79,18 +79,20 @@ TEST_CASE("[Files] Subdir include Win")
     REQUIRE( synth.getRegionView(0)->sample == "dummy_subdir.wav" );
 }
 
-TEST_CASE("[Files] Recursive include")
+TEST_CASE("[Files] Recursive include (with include guard)")
 {
     sfz::Synth synth;
+    synth.enableRecursiveIncludeGuard();
     synth.loadSfzFile(std::filesystem::current_path() / "tests/TestFiles/Includes/root_recursive.sfz");
     REQUIRE( synth.getNumRegions() == 2 );
     REQUIRE( synth.getRegionView(0)->sample == "dummy_recursive2.wav" );
     REQUIRE( synth.getRegionView(1)->sample == "dummy_recursive1.wav" );
 }
 
-TEST_CASE("[Files] Include loops")
+TEST_CASE("[Files] Include loops (with include guard)")
 {
     sfz::Synth synth;
+    synth.enableRecursiveIncludeGuard();
     synth.loadSfzFile(std::filesystem::current_path() / "tests/TestFiles/Includes/root_loop.sfz");
     REQUIRE( synth.getNumRegions() == 2 );
     REQUIRE( synth.getRegionView(0)->sample == "dummy_loop2.wav" );
diff --git a/tests/StereoBufferT.cpp b/tests/StereoBufferT.cpp
index 2f803cec..b5c41923 100644
--- a/tests/StereoBufferT.cpp
+++ b/tests/StereoBufferT.cpp
@@ -200,10 +200,10 @@ TEST_CASE("[AudioBuffer] fills")
         REQUIRE( real == expected );
     }
 
-    SECTION("Floats - 0.0 - SSE")
+    SECTION("Floats - 0.0 - SIMD")
     {
         StereoBuffer<float> buffer(10);
-        buffer.fill<SIMD::sse>(0.0f);
+        buffer.fill<true>(0.0f);
         std::array<float, 10> expected;
         std::fill(expected.begin(), expected.end(), 0.0f);
         std::array<float, 10> real { 2.0f };
@@ -217,10 +217,10 @@ TEST_CASE("[AudioBuffer] fills")
         REQUIRE( real == expected );
     }
 
-    SECTION("Floats - 1.0 - SSE")
+    SECTION("Floats - 1.0 - SIMD")
     {
         StereoBuffer<float> buffer(10);
-        buffer.fill<SIMD::sse>(1.0f);
+        buffer.fill<true>(1.0f);
         std::array<float, 10> expected { 1.0f };
         std::fill(expected.begin(), expected.end(), 1.0f);
         std::array<float, 10> real { 2.0f };
@@ -250,12 +250,12 @@ TEST_CASE("[StereoBuffer] Interleave read")
     REQUIRE( real == expected );
 }
 
-TEST_CASE("[StereoBuffer] Interleave read -- SSE")
+TEST_CASE("[StereoBuffer] Interleave read -- SIMD")
 {
     StereoBuffer<float> buffer(8);
     std::array<float, 16> input = { 0.0f, 10.0f, 1.0f, 11.0f, 2.0f, 12.0f, 3.0f, 13.0f, 4.0f, 14.0f, 5.0f, 15.0f, 6.0f, 16.0f, 7.0f, 17.0f};
     std::array<float, 16> expected = { 0.0f, 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 10.0f, 11.0f, 12.0f, 13.0f, 14.0f, 15.0f, 16.0f, 17.0f };
-    buffer.readInterleaved<SIMD::sse>(input.data(), 8);
+    buffer.readInterleaved<true>(input.data(), 8);
     std::array<float, 16> real { 0.0f };
     auto realIdx = 0;
     for (auto frameIdx = 0; frameIdx < buffer.getNumFrames(); ++frameIdx)
@@ -265,12 +265,12 @@ TEST_CASE("[StereoBuffer] Interleave read -- SSE")
     REQUIRE( real == expected );
 }
 
-TEST_CASE("[StereoBuffer] Interleave read unaligned end -- SSE")
+TEST_CASE("[StereoBuffer] Interleave read unaligned end -- SIMD")
 {
     StereoBuffer<float> buffer(10);
     std::array<float, 20> input = { 0.0f, 10.0f, 1.0f, 11.0f, 2.0f, 12.0f, 3.0f, 13.0f, 4.0f, 14.0f, 5.0f, 15.0f, 6.0f, 16.0f, 7.0f, 17.0f, 8.0f, 18.0f, 9.0f, 19.0f};
     std::array<float, 20> expected = { 0.0f, 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f, 9.0f, 10.0f, 11.0f, 12.0f, 13.0f, 14.0f, 15.0f, 16.0f, 17.0f, 18.0f, 19.0f};
-    buffer.readInterleaved<SIMD::sse>(input.data(), 10);
+    buffer.readInterleaved<true>(input.data(), 10);
     std::array<float, 20> real { 0.0f };
     auto realIdx = 0;
     for (auto frameIdx = 0; frameIdx < buffer.getNumFrames(); ++frameIdx)
@@ -280,7 +280,22 @@ TEST_CASE("[StereoBuffer] Interleave read unaligned end -- SSE")
     REQUIRE( real == expected );
 }
 
-TEST_CASE("[StereoBuffer] SSE vs scalar")
+TEST_CASE("[StereoBuffer] small interleaved read unaligned end -- SIMD")
+{
+    StereoBuffer<float> buffer(3);
+    std::array<float, 20> input = { 0.0f, 10.0f, 1.0f, 11.0f, 2.0f, 12.0f};
+    std::array<float, 20> expected = { 0.0f, 1.0f, 2.0f, 10.0f, 11.0f, 12.0f};
+    buffer.readInterleaved<true>(input.data(), 3);
+    std::array<float, 20> real { 0.0f };
+    auto realIdx = 0;
+    for (auto frameIdx = 0; frameIdx < buffer.getNumFrames(); ++frameIdx)
+        real[realIdx++] = buffer(Channel::left, frameIdx);
+    for (auto frameIdx = 0; frameIdx < buffer.getNumFrames(); ++frameIdx)
+        real[realIdx++] = buffer(Channel::right, frameIdx);
+    REQUIRE( real == expected );
+}
+
+TEST_CASE("[StereoBuffer] SIMD vs scalar")
 {
     constexpr int numFrames { 91 };
     StereoBuffer<float> buffer(numFrames);
@@ -288,7 +303,7 @@ TEST_CASE("[StereoBuffer] SSE vs scalar")
     std::iota(input.begin(), input.end(), 0.0f);
     StereoBuffer<float> expectedBuffer (numFrames);
     expectedBuffer.readInterleaved(input.data(), 10);
-    buffer.readInterleaved<SIMD::sse>(input.data(), 10);
+    buffer.readInterleaved<true>(input.data(), 10);
     std::array<float, numFrames * 2> expectedArray { 0.0f };
     std::array<float, numFrames * 2> realArray { 0.0f };
     auto sampleIdx = 0;
@@ -312,4 +327,34 @@ TEST_CASE("[AudioBuffer] Fill a big Audiobuffer")
     std::vector<float> input (2*size);
     std::iota(input.begin(), input.end(), 1.0f);
     buffer.readInterleaved(input.data(), size);
+}
+
+TEST_CASE("[StereoBuffer] Interleaved write -- Scalar")
+{
+    StereoBuffer<float> buffer(10);
+    std::array<float, 20> input  = { 0.0f, 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f, 9.0f, 10.0f, 11.0f, 12.0f, 13.0f, 14.0f, 15.0f, 16.0f, 17.0f, 18.0f, 19.0f};
+    std::array<float, 20> output { 0.0f };
+    buffer.readInterleaved<false>(input.data(), 10);
+    buffer.writeInterleaved<false>(output.data(), 10);
+    REQUIRE( output == input );
+}
+
+TEST_CASE("[StereoBuffer] Interleaved write -- SIMD")
+{
+    StereoBuffer<float> buffer(10);
+    std::array<float, 20> input  = { 0.0f, 10.0f, 1.0f, 11.0f, 2.0f, 12.0f, 3.0f, 13.0f, 4.0f, 14.0f, 5.0f, 15.0f, 6.0f, 16.0f, 7.0f, 17.0f, 8.0f, 18.0f, 9.0f, 19.0f};
+    std::array<float, 20> output { 0.0f };
+    buffer.readInterleaved<false>(input.data(), 10);
+    buffer.writeInterleaved<true>(output.data(), 10);
+    REQUIRE( output == input );
+}
+
+TEST_CASE("[StereoBuffer] Small interleaved write -- SIMD")
+{
+    StereoBuffer<float> buffer(3);
+    std::array<float, 20> input  = { 0.0f, 10.0f, 1.0f, 11.0f, 2.0f, 12.0f};
+    std::array<float, 20> output { 0.0f };
+    buffer.readInterleaved<false>(input.data(), 3);
+    buffer.writeInterleaved<true>(output.data(), 3);
+    REQUIRE( output == input );
 }
\ No newline at end of file
diff --git a/tests/TestFiles/36-CajonCenter-1.wav b/tests/TestFiles/36-CajonCenter-1.wav
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new file mode 100755
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