diff --git a/xybrid/nodelib/instrumentcore.h b/xybrid/nodelib/instrumentcore.h
index ee8e0d3..54308d7 100644
--- a/xybrid/nodelib/instrumentcore.h
+++ b/xybrid/nodelib/instrumentcore.h
@@ -3,11 +3,26 @@
 #include <memory>
 #include <functional>
 #include <unordered_map>
+#ifdef WITH_BOOST
+#include <boost/container/pmr/memory_resource.hpp>
+#include <boost/container/pmr/polymorphic_allocator.hpp>
+using boost::container::pmr::polymorphic_allocator;
+template <class Key,
+             class T,
+             class Hash = std::hash<Key>,
+             class Pred = std::equal_to<Key>>
+   using unordered_map = std::unordered_map<Key, T, Hash, Pred, polymorphic_allocator<std::pair<const Key,T>>>;
+template <class Key, class T,
+          class Hash = std::hash<Key>,
+          class Pred = std::equal_to<Key>>
+using unordered_multimap = std::unordered_multimap<Key, T, Hash, Pred, polymorphic_allocator<std::pair<const Key,T>>>;
+#else
+    using std::pmr::unordered_map;
+    using std::pmr::unordered_multimap;
+#endif
 #include <array>
 #include "nodelib/basics.h"
-
 #include "data/node.h"
-
 #include "util/mem.h"
 
 namespace Xybrid::Data {
@@ -91,8 +106,8 @@ namespace Xybrid::NodeLib {
         double volume = 1.0;
         double pan = 0.0;
 
-        std::pmr::unordered_map<uint16_t, Note> activeNotes = {16, Util::ralloc};
-        std::pmr::unordered_multimap<uint16_t, Tween> activeTweens = {16, Util::ralloc};
+        unordered_map<uint16_t, Note> activeNotes = {16, Util::ralloc};
+        unordered_multimap<uint16_t, Tween> activeTweens = {16, Util::ralloc};
 
         std::function<bool(Note*, const ParamReader&)> paramFilter;
         std::unordered_map<uint8_t, std::function<bool(const ParamReader&)>> globalParam;
diff --git a/xybrid/nodelib/svfilter.cpp b/xybrid/nodelib/svfilter.cpp
index a027ff2..5c1e5ba 100644
--- a/xybrid/nodelib/svfilter.cpp
+++ b/xybrid/nodelib/svfilter.cpp
@@ -10,7 +10,7 @@ using namespace Xybrid::Audio;
 
 template class Xybrid::NodeLib::GenericSVFilter<AudioFrame>;
 template class Xybrid::NodeLib::GenericSVFilter<double>;
-
+/*
 template<typename DT>
 void GenericSVFilter<DT>::process(DT in, double cutoff, double resonance, int ovs) {
     if (ovs <= 0) return;
@@ -28,3 +28,4 @@ void GenericSVFilter<DT>::process(DT in, double cutoff, double resonance, int ov
     }
     notch = high+low;
 }
+*/
diff --git a/xybrid/nodelib/svfilter.h b/xybrid/nodelib/svfilter.h
index 70fa803..bb962dd 100644
--- a/xybrid/nodelib/svfilter.h
+++ b/xybrid/nodelib/svfilter.h
@@ -2,8 +2,10 @@
 
 #include <cstring>
 #include <cmath>
-
 #include "data/audioframe.h"
+#include "nodelib/basics.h"
+#include "audio/audioengine.h"
+using namespace Xybrid::Audio;
 
 namespace Xybrid::NodeLib {
     /// 12db Chamberlin State Variable Filter
@@ -23,7 +25,22 @@ namespace Xybrid::NodeLib {
         inline GenericSVFilter<DT>(const GenericSVFilter<DT>& o) { std::memcpy(static_cast<void*>(this), static_cast<const void*>(&o), sizeof(o)); }
         inline GenericSVFilter<DT>& operator=(const GenericSVFilter<DT>& o) { std::memcpy(static_cast<void*>(this), static_cast<const void*>(&o), sizeof(o)); return *this; }
 
-        void process(DT in, double cutoff, double resonance, int oversamp = DEFAULT_OVERSAMP);
+        void process(DT in, double cutoff, double resonance, int oversamp = DEFAULT_OVERSAMP) {
+                if (oversamp <= 0) return;
+                cutoff = std::max(cutoff, 1.0);
+                resonance = std::max(resonance, 0.01);
+
+                double f = 2.0 * std::sin(PI * cutoff / (audioEngine->curSampleRate() * oversamp));
+                double q = std::sqrt(1.0 - std::atan(std::sqrt(resonance)) * 2.0 / PI);
+                double damp = std::sqrt(q);
+
+                for (int i = 0; i < oversamp; i++) {
+                    low += band*f;
+                    high = in*damp - low - band*q;
+                    band += high*f;
+                }
+                notch = high+low;
+        }
         inline void reset() { low = 0.0; high = 0.0; band = 0.0; notch = 0.0; }
         inline void normalize(double m) {
             if constexpr (std::is_arithmetic_v<DT>) {
@@ -48,7 +65,7 @@ namespace Xybrid::NodeLib {
     extern template void Xybrid::NodeLib::GenericSVFilter<double>::process(double, double, double, int);
 
     /// 12db Chamberlin State Variable Filter
-    typedef GenericSVFilter<Data::AudioFrame> SVFilter;
+    typedef GenericSVFilter<Xybrid::Data::AudioFrame> SVFilter;
     /// 12db Chamberlin State Variable Filter (mono version)
     typedef GenericSVFilter<double> SVFilterM;
 }
diff --git a/xybrid/nodes/effect/svf.h b/xybrid/nodes/effect/svf.h
index cd67c6f..bebdb9d 100644
--- a/xybrid/nodes/effect/svf.h
+++ b/xybrid/nodes/effect/svf.h
@@ -16,7 +16,6 @@
 
 #include "data/node.h"
 #include "data/audioframe.h"
-
 #include "nodelib/svfilter.h"
 #include "nodelib/param.h"
 
diff --git a/xybrid/nodes/gadget/quicklevel.h b/xybrid/nodes/gadget/quicklevel.h
index 1de334d..431543e 100644
--- a/xybrid/nodes/gadget/quicklevel.h
+++ b/xybrid/nodes/gadget/quicklevel.h
@@ -4,7 +4,7 @@
 
 #include "data/node.h"
 #include "data/audioframe.h"
-
+#include <array>
 namespace Xybrid::Gadgets {
     class QuickLevel : public Data::Node {
         QContiguousCache<Data::AudioFrame> buf;
diff --git a/xybrid/util/mem.cpp b/xybrid/util/mem.cpp
index adc350e..e16f309 100644
--- a/xybrid/util/mem.cpp
+++ b/xybrid/util/mem.cpp
@@ -2,7 +2,7 @@
 
 using namespace Xybrid::Util;
 
-std::pmr::synchronized_pool_resource Xybrid::Util::rpool; // instantiate
+synchronized_pool_resource Xybrid::Util::rpool; // instantiate
 decltype(Xybrid::Util::ralloc) Xybrid::Util::ralloc(&rpool);
 
 namespace {
@@ -15,7 +15,7 @@ void Xybrid::Util::reserveInitialPool() {
 
     const constexpr size_t rsize = 1024*1024*128;
     size_t bsize = rpool.options().largest_required_pool_block;
-    std::vector<void*> allocs;
+    vector<void*> allocs;
     for (size_t ts = 0; ts < rsize; ts += bsize) {
         allocs.push_back(rpool.allocate(bsize));
     }
diff --git a/xybrid/util/mem.h b/xybrid/util/mem.h
index 75736d2..4463d7b 100644
--- a/xybrid/util/mem.h
+++ b/xybrid/util/mem.h
@@ -3,12 +3,32 @@
 #include <cstddef>
 #include <list>
 #include <deque>
+#ifdef WITH_BOOST
+#include <boost/container/pmr/memory_resource.hpp>
+#include <boost/container/pmr/polymorphic_allocator.hpp>
+#include <boost/container/pmr/synchronized_pool_resource.hpp>
+#include <boost/container/vector.hpp>
+using boost::container::pmr::synchronized_pool_resource;
+using boost::container::pmr::polymorphic_allocator;
+using boost::container::vector;
+#else
 #include <memory_resource>
+using std::pmr::synchronized_pool_resource;
+using std::pmr::polymorphic_allocator;
+#endif
 #include <unordered_set>
-
+#ifdef WITH_BOOST
+    template <class Key,
+              class Hash = std::hash<Key>,
+              class Pred = std::equal_to<Key>>
+    using unordered_set = std::unordered_set<Key, Hash, Pred, polymorphic_allocator<Key>>;
+#else
+    using std::pmr::unordered_set;
+    using std::vector;
+#endif
 namespace Xybrid::Util {
-    extern std::pmr::synchronized_pool_resource rpool;
-    extern std::pmr::polymorphic_allocator<std::max_align_t> ralloc;
+    extern synchronized_pool_resource rpool;
+    extern polymorphic_allocator<std::max_align_t> ralloc;
 
     void reserveInitialPool();
 
@@ -18,7 +38,7 @@ namespace Xybrid::Util {
         std::list<slot[PSIZE]> pages;
 
         std::deque<T*> avail;
-        std::pmr::unordered_set<T*> used = {rpool};
+        unordered_set<T*> used = {rpool};
 
         void newPage() {
             auto p = pages.emplace_back();
diff --git a/xybrid/xybrid.pro b/xybrid/xybrid.pro
index 75f0fac..003945b 100644
--- a/xybrid/xybrid.pro
+++ b/xybrid/xybrid.pro
@@ -26,7 +26,7 @@ DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x050F00
 
 DISTFILES += ../.astylerc
 
-CONFIG += c++20
+CONFIG += c++2a
 
 # use all optimizations that won't generally interfere with debugging
 QMAKE_CXXFLAGS_DEBUG += -Og
@@ -49,12 +49,12 @@ freebsd-clang {
 
 macx: {
     DEFINES += WITH_BOOST
-    LIBS += -L/usr/local/Cellar/boost/1.70.0/lib/ -lboost_math_tr1
+    LIBS += -L/Users/rachel/.nix-profile/lib -lboost_container -lboost_math_tr1
     LIBS    += -framework OpenGL
     LIBS    += -framework Foundation
     SOURCES +=
     HEADERS +=
-    QMAKE_CXXFLAGS += -g -I/usr/local/Cellar/boost/1.70.0/include/
+    QMAKE_CXXFLAGS += -g -I/nix/store/gp7ascpyzsprb2i79kl5a22rmyawwscb-boost-1.77.0-dev/include
 }