diff --git a/cmake/SfizzConfig.cmake b/cmake/SfizzConfig.cmake
index 5696f712..0f5ebcf1 100644
--- a/cmake/SfizzConfig.cmake
+++ b/cmake/SfizzConfig.cmake
@@ -1,5 +1,5 @@
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_C_STANDARD 99)
+set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard to be used")
+set(CMAKE_C_STANDARD 99 CACHE STRING "C standard to be used")
 
 # Export the compile_commands.json file
 set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 14d469f6..f1378612 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -18,6 +18,7 @@ set (SFIZZ_SOURCES
     sfizz/effects/Nothing.cpp
     sfizz/effects/Filter.cpp
     sfizz/effects/Eq.cpp
+    sfizz/effects/Apan.cpp
     sfizz/effects/Lofi.cpp
 )
 include (SfizzSIMDSourceFiles)
diff --git a/src/external/atomic_queue/atomic_queue.h b/src/external/atomic_queue/atomic_queue.h
index e7bcf0f2..731d9a11 100644
--- a/src/external/atomic_queue/atomic_queue.h
+++ b/src/external/atomic_queue/atomic_queue.h
@@ -150,7 +150,7 @@ protected:
 
     // The special member functions are not thread-safe.
 
-    AtomicQueueCommon() noexcept = default;
+    AtomicQueueCommon() = default;
 
     AtomicQueueCommon(AtomicQueueCommon const& b) noexcept
         : head_(b.head_.load(X))
@@ -417,7 +417,7 @@ class AtomicQueue2 : public AtomicQueueCommon<AtomicQueue2<T, SIZE, MINIMIZE_CON
 public:
     using value_type = T;
 
-    AtomicQueue2() noexcept = default;
+    AtomicQueue2() = default;
     AtomicQueue2(AtomicQueue2 const&) = delete;
     AtomicQueue2& operator=(AtomicQueue2 const&) = delete;
 };
diff --git a/src/sfizz/Defaults.h b/src/sfizz/Defaults.h
index 4d01301c..3f53ecc3 100644
--- a/src/sfizz/Defaults.h
+++ b/src/sfizz/Defaults.h
@@ -206,5 +206,10 @@ namespace Default
 	constexpr bool checkSostenuto { true }; // sostenuto_sw
     constexpr Range<int> octaveOffsetRange { -10, 10 }; // octave_offset
     constexpr Range<int> noteOffsetRange { -127, 127 }; // note_offset
+
+    constexpr Range<int> apanWaveformRange { 0, std::numeric_limits<int>::max() };
+    constexpr Range<float> apanFrequencyRange { 0, std::numeric_limits<float>::max() };
+    constexpr Range<float> apanPhaseRange { 0.0, 360.0 };
+    constexpr Range<float> apanLevelRange { 0.0, 100.0 };
 }
 }
diff --git a/src/sfizz/Effects.cpp b/src/sfizz/Effects.cpp
index 7031582f..3398cc3d 100644
--- a/src/sfizz/Effects.cpp
+++ b/src/sfizz/Effects.cpp
@@ -12,6 +12,7 @@
 #include "effects/Nothing.h"
 #include "effects/Filter.h"
 #include "effects/Eq.h"
+#include "effects/Apan.h"
 #include "effects/Lofi.h"
 #include <algorithm>
 
@@ -22,6 +23,7 @@ void EffectFactory::registerStandardEffectTypes()
     // TODO
     registerEffectType("filter", fx::Filter::makeInstance);
     registerEffectType("eq", fx::Eq::makeInstance);
+    registerEffectType("apan", fx::Apan::makeInstance);
     registerEffectType("lofi", fx::Lofi::makeInstance);
 }
 
diff --git a/src/sfizz/LeakDetector.h b/src/sfizz/LeakDetector.h
index a8333c63..02e3da41 100644
--- a/src/sfizz/LeakDetector.h
+++ b/src/sfizz/LeakDetector.h
@@ -47,6 +47,8 @@ public:
         }
     }
 
+    LeakDetector& operator=(const LeakDetector&) = default;
+
 private:
     struct ObjectCounter {
         ObjectCounter() = default;
diff --git a/src/sfizz/Macros.h b/src/sfizz/Macros.h
index f610eefb..4eaa1a11 100644
--- a/src/sfizz/Macros.h
+++ b/src/sfizz/Macros.h
@@ -20,6 +20,9 @@
 
 #if __cplusplus > 201103L
 #define CXX14_CONSTEXPR constexpr
+#define CXX11_MOVE(x) x
 #else
 #define CXX14_CONSTEXPR
+#define CXX11_MOVE(x) std::move(x)
 #endif
+
diff --git a/src/sfizz/effects/Apan.cpp b/src/sfizz/effects/Apan.cpp
new file mode 100644
index 00000000..473985fd
--- /dev/null
+++ b/src/sfizz/effects/Apan.cpp
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+/*
+   Note(jpc): implementation status
+
+- [x] apan_waveform
+- [x] apan_freq
+- [ ] apan_freq_oncc
+- [x] apan_phase
+- [ ] apan_phase_oncc
+- [x] apan_dry
+- [ ] apan_dry_oncc
+- [x] apan_wet
+- [ ] apan_wet_oncc
+- [x] apan_depth
+- [ ] apan_depth_oncc
+*/
+
+#include "Apan.h"
+#include "Macros.h"
+#include "CommonLFO.h"
+#include "Opcode.h"
+#include <limits>
+#include <cmath>
+
+namespace sfz {
+namespace fx {
+
+    void Apan::setSampleRate(double sampleRate)
+    {
+        _samplePeriod = 1.0 / sampleRate;
+    }
+
+    void Apan::setSamplesPerBlock(int samplesPerBlock)
+    {
+        _lfoOutLeft.resize(samplesPerBlock);
+        _lfoOutRight.resize(samplesPerBlock);
+    }
+
+    void Apan::clear()
+    {
+        _lfoPhase = 0.0;
+    }
+
+    void Apan::process(const float* const inputs[], float* const outputs[], unsigned nframes)
+    {
+        float dry = _dry;
+        float wet = _wet;
+        float depth = _depth;
+        float* modL = _lfoOutLeft.data();
+        float* modR = _lfoOutRight.data();
+
+        computeLfos(modL, modR, nframes);
+
+        const float* inL = inputs[0];
+        const float* inR = inputs[1];
+        float* outL = outputs[0];
+        float* outR = outputs[1];
+
+        for (unsigned i = 0; i < nframes; ++i) {
+            float modDD = depth * 0.5f * (modL[i] - modR[i]); // LFO in ±depth
+
+            // uses a linear pan law
+            float gainL = 1 - modDD;
+            float gainR = 1 + modDD;
+
+            outL[i] = inL[i] * (gainL * wet + dry);
+            outR[i] = inR[i] * (gainR * wet + dry);
+        }
+    }
+
+    std::unique_ptr<Effect> Apan::makeInstance(absl::Span<const Opcode> members)
+    {
+        std::unique_ptr<Apan> fx { new Apan };
+
+        for (const Opcode& opc : members) {
+            switch (opc.lettersOnlyHash) {
+            case hash("apan_waveform"):
+                if (auto value = readOpcode(opc.value, Default::apanWaveformRange))
+                    fx->_lfoWave = *value;
+                break;
+            case hash("apan_freq"):
+                if (auto value = readOpcode(opc.value, Default::apanFrequencyRange))
+                    fx->_lfoFrequency = *value;
+                break;
+            case hash("apan_phase"):
+                if (auto value = readOpcode(opc.value, Default::apanPhaseRange)) {
+                    float phase = *value / 360.0f;
+                    phase -= static_cast<int>(phase);
+                    fx->_lfoPhaseOffset = phase;
+                }
+                break;
+            case hash("apan_dry"):
+                if (auto value = readOpcode(opc.value, Default::apanLevelRange))
+                    fx->_dry = *value / 100.0f;
+                break;
+            case hash("apan_wet"):
+                if (auto value = readOpcode(opc.value, Default::apanLevelRange))
+                    fx->_wet = *value / 100.0f;
+                break;
+            case hash("apan_depth"):
+                if (auto value = readOpcode(opc.value, Default::apanLevelRange))
+                    fx->_depth = *value / 100.0f;
+                break;
+            }
+        }
+
+        return CXX11_MOVE(fx);
+    }
+
+    void Apan::computeLfos(float* left, float* right, unsigned nframes)
+    {
+        switch (_lfoWave) {
+        #define CASE(X) case lfo::X:                          \
+            computeLfos<lfo::X>(left, right, nframes); break;
+        default:
+        CASE(kTriangle)
+        CASE(kSine)
+        CASE(kPulse75)
+        CASE(kSquare)
+        CASE(kPulse25)
+        CASE(kPulse12_5)
+        CASE(kRamp)
+        CASE(kSaw)
+        #undef CASE
+        }
+    }
+
+    template <int Wave> void Apan::computeLfos(float* left, float* right, unsigned nframes)
+    {
+        float samplePeriod = _samplePeriod;
+        float frequency = _lfoFrequency;
+        float offset = _lfoPhaseOffset;
+        float phaseLeft = _lfoPhase;
+
+        for (unsigned i = 0; i < nframes; ++i) {
+            float phaseRight = phaseLeft + offset;
+            phaseRight -= static_cast<int>(phaseRight);
+
+            left[i] = lfo::evaluateAtPhase<Wave>(phaseLeft);
+            right[i] = lfo::evaluateAtPhase<Wave>(phaseRight);
+
+            phaseLeft += frequency * samplePeriod;
+            phaseLeft -= static_cast<int>(phaseLeft);
+        }
+
+        _lfoPhase = phaseLeft;
+    }
+
+} // namespace fx
+} // namespace sfz
diff --git a/src/sfizz/effects/Apan.h b/src/sfizz/effects/Apan.h
new file mode 100644
index 00000000..52b85dc6
--- /dev/null
+++ b/src/sfizz/effects/Apan.h
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#pragma once
+#include "Effects.h"
+#include "Buffer.h"
+
+namespace sfz {
+namespace fx {
+
+    /**
+     * @brief Effect which does nothing
+     */
+    class Apan : public Effect {
+    public:
+        /**
+         * @brief Initializes with the given sample rate.
+         */
+        void setSampleRate(double sampleRate) override;
+
+        /**
+         * @brief Sets the maximum number of frames to render at a time. The actual
+         * value can be lower but should never be higher.
+         */
+        void setSamplesPerBlock(int samplesPerBlock) override;
+
+        /**
+         * @brief Reset the state to initial.
+         */
+        void clear() override;
+
+        /**
+         * @brief Copy the input signal to the output
+         */
+        void process(const float* const inputs[], float* const outputs[], unsigned nframes) override;
+
+        /**
+          * @brief Instantiates given the contents of the <effect> block.
+          */
+        static std::unique_ptr<Effect> makeInstance(absl::Span<const Opcode> members);
+
+    private:
+        void computeLfos(float* left, float* right, unsigned nframes);
+        template <int Wave> void computeLfos(float* left, float* right, unsigned nframes);
+
+    private:
+        float _samplePeriod = 0.0;
+        sfz::Buffer<float> _lfoOutLeft { config::defaultSamplesPerBlock };
+        sfz::Buffer<float> _lfoOutRight { config::defaultSamplesPerBlock };
+
+        // Controls
+        float _dry = 0.0;
+        float _wet = 0.0;
+        float _depth = 0.0;
+        int _lfoWave = 0;
+        float _lfoFrequency = 0.0;
+        float _lfoPhaseOffset = 0.5;
+
+        // State
+        float _lfoPhase = 0.0;
+    };
+
+} // namespace fx
+} // namespace sfz
diff --git a/src/sfizz/effects/CommonLFO.h b/src/sfizz/effects/CommonLFO.h
new file mode 100644
index 00000000..3129e1c5
--- /dev/null
+++ b/src/sfizz/effects/CommonLFO.h
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#pragma once
+
+namespace sfz {
+namespace fx {
+namespace lfo {
+
+enum Wave {
+    kTriangle,
+    kSine,
+    kPulse75,
+    kSquare,
+    kPulse25,
+    kPulse12_5,
+    kRamp,
+    kSaw,
+};
+
+template <int Wave> float evaluateAtPhase(float phase);
+
+} // namespace lfo
+} // namespace fx
+} // namespace sfz
+
+#include "CommonLFO.hpp"
diff --git a/src/sfizz/effects/CommonLFO.hpp b/src/sfizz/effects/CommonLFO.hpp
new file mode 100644
index 00000000..ef6eef36
--- /dev/null
+++ b/src/sfizz/effects/CommonLFO.hpp
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#include "CommonLFO.h"
+#include <cmath>
+
+namespace sfz {
+namespace fx {
+namespace lfo {
+
+    template <>
+    inline float evaluateAtPhase<kTriangle>(float phase)
+    {
+        float y = -4 * phase + 2;
+        y = (phase < 0.25f) ? (4 * phase) : y;
+        y = (phase > 0.75f) ? (4 * phase - 4) : y;
+        return y;
+    }
+
+    template <>
+    inline float evaluateAtPhase<kSine>(float phase)
+    {
+        float x = phase + phase - 1;
+        return 4 * x * (1 - std::fabs(x));
+    }
+
+    template <>
+    inline float evaluateAtPhase<kPulse75>(float phase)
+    {
+        return (phase < 0.75f) ? +1.0f : -1.0f;
+    }
+
+    template <>
+    inline float evaluateAtPhase<kSquare>(float phase)
+    {
+        return (phase < 0.5f) ? +1.0f : -1.0f;
+    }
+
+    template <>
+    inline float evaluateAtPhase<kPulse25>(float phase)
+    {
+        return (phase < 0.25f) ? +1.0f : -1.0f;
+    }
+
+    template <>
+    inline float evaluateAtPhase<kPulse12_5>(float phase)
+    {
+        return (phase < 0.125f) ? +1.0f : -1.0f;
+    }
+
+    template <>
+    inline float evaluateAtPhase<kRamp>(float phase)
+    {
+        return 2 * phase - 1;
+    }
+
+    template <>
+    inline float evaluateAtPhase<kSaw>(float phase)
+    {
+        return 1 - 2 * phase;
+    }
+
+} // namespace lfo
+} // namespace fx
+} // namespace sfz
diff --git a/src/sfizz/effects/Lofi.cpp b/src/sfizz/effects/Lofi.cpp
index f29d9950..87d64264 100644
--- a/src/sfizz/effects/Lofi.cpp
+++ b/src/sfizz/effects/Lofi.cpp
@@ -92,7 +92,7 @@ namespace fx {
             }
         }
 
-        return std::move(fx);
+        return CXX11_MOVE(fx);
     }
 
     ///