diff --git a/.travis.yml b/.travis.yml
index f118980a..0c653e66 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,8 +14,10 @@ jobs:
       apt:
         packages:
         - clang-tidy
+        - wget
+        - unzip
         - libsndfile-dev
-    install: skip
+    install: .travis/download_vst_sdk.sh
     script: scripts/run_clang_tidy.sh
 
   - name: "Linux amd64 tests"
diff --git a/.travis/download_vst_sdk.sh b/.travis/download_vst_sdk.sh
new file mode 100755
index 00000000..3eee309e
--- /dev/null
+++ b/.travis/download_vst_sdk.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+set -ex
+
+vst_download_prefix="vst/download"
+vst_sdk_archive="vst-sdk_3.6.14_build-24_2019-11-29.zip"
+mkdir -p ${vst_download_prefix}
+if ! [[ -f "${vst_download_prefix}/${vst_sdk_archive}" ]]; then
+  wget -P ${vst_download_prefix} "https://download.steinberg.net/sdk_downloads/${vst_sdk_archive}"
+fi
+mkdir -p vst/external
+unzip -ouq "${vst_download_prefix}/${vst_sdk_archive}" -d "vst/external"
diff --git a/scripts/run_clang_tidy.sh b/scripts/run_clang_tidy.sh
index e660173b..7431d3f5 100755
--- a/scripts/run_clang_tidy.sh
+++ b/scripts/run_clang_tidy.sh
@@ -19,6 +19,14 @@ clang-tidy \
   src/sfizz/SIMDSSE.cpp \
   src/sfizz/Synth.cpp \
   src/sfizz/Voice.cpp \
+  src/sfizz/effects/Eq.cpp \
+  src/sfizz/effects/Filter.cpp \
   src/sfizz/effects/Lofi.cpp \
   src/sfizz/effects/Nothing.cpp \
-  -- -Iexternal/abseil-cpp -Isrc/external -Isrc/external/pugixml/src -Isrc/sfizz -Isrc
+  vst/SfizzVstController.cpp \
+  vst/SfizzVstProcessor.cpp \
+  vst/SfizzVstEditor.cpp \
+  vst/SfizzVstState.cpp \
+  -- -Iexternal/abseil-cpp -Isrc/external -Isrc/external/pugixml/src \
+      -Isrc/sfizz -Isrc \
+      -Ivst -Ivst/external/VST_SDK/VST3_SDK -Ivst/external/VST_SDK/VST3_SDK/vstgui4 -DNDEBUG
diff --git a/vst/SfizzVstController.cpp b/vst/SfizzVstController.cpp
index cc13b355..5598ca43 100644
--- a/vst/SfizzVstController.cpp
+++ b/vst/SfizzVstController.cpp
@@ -84,7 +84,7 @@ tresult PLUGIN_API SfizzVstControllerNoUi::getParamStringByValue(Vst::ParamID ta
     switch (tag) {
     case kPidOversampling:
         {
-            int factorLog2 = kParamOversamplingRange.denormalize(valueNormalized);
+            auto factorLog2 = static_cast<int>(kParamOversamplingRange.denormalize(valueNormalized));
             Steinberg::String buf;
             buf.printf("%dX", 1 << factorLog2);
             buf.copyTo(string);
diff --git a/vst/SfizzVstProcessor.cpp b/vst/SfizzVstProcessor.cpp
index 55877da3..62d6b785 100644
--- a/vst/SfizzVstProcessor.cpp
+++ b/vst/SfizzVstProcessor.cpp
@@ -12,7 +12,13 @@
 #include "pluginterfaces/vst/ivstparameterchanges.h"
 #include <cstring>
 
-#pragma message("TODO: send tempo")
+#pragma message("TODO: send tempo") // NOLINT
+
+template<class T>
+constexpr int fastRound(T x)
+{
+    return static_cast<int>(x + T{ 0.5 }); // NOLINT
+}
 
 SfizzVstProcessor::SfizzVstProcessor()
     : _fifoToWorker(1024)
@@ -22,7 +28,11 @@ SfizzVstProcessor::SfizzVstProcessor()
 
 SfizzVstProcessor::~SfizzVstProcessor()
 {
-    setActive(false); // to be sure
+    try {
+        stopBackgroundWork();
+    } catch (const std::exception& e) {
+        fprintf(stderr, "Caught exception: %s\n", e.what());
+    }
 }
 
 tresult PLUGIN_API SfizzVstProcessor::initialize(FUnknown* context)
@@ -186,7 +196,7 @@ void SfizzVstProcessor::processParameterChanges(Vst::IParameterChanges& pc)
                     break;
                 msg->setMessageID("SetNumVoices");
                 Vst::IAttributeList* attr = msg->getAttributes();
-                attr->setInt("NumVoices", kParamNumVoicesRange.denormalize(value));
+                attr->setInt("NumVoices", static_cast<Steinberg::int64>(kParamNumVoicesRange.denormalize(value)));
                 if (!_fifoToWorker.push(msg)) {
                     msg->release();
                     break;
@@ -201,7 +211,7 @@ void SfizzVstProcessor::processParameterChanges(Vst::IParameterChanges& pc)
                     break;
                 msg->setMessageID("SetOversampling");
                 Vst::IAttributeList* attr = msg->getAttributes();
-                attr->setInt("Oversampling", kParamOversamplingRange.denormalize(value));
+                attr->setInt("Oversampling", static_cast<Steinberg::int64>(kParamOversamplingRange.denormalize(value)));
                 if (!_fifoToWorker.push(msg)) {
                     msg->release();
                     break;
@@ -216,7 +226,7 @@ void SfizzVstProcessor::processParameterChanges(Vst::IParameterChanges& pc)
                     break;
                 msg->setMessageID("SetPreloadSize");
                 Vst::IAttributeList* attr = msg->getAttributes();
-                attr->setInt("PreloadSize", kParamPreloadSizeRange.denormalize(value));
+                attr->setInt("PreloadSize", static_cast<Steinberg::int64>(kParamPreloadSizeRange.denormalize(value)));
                 if (!_fifoToWorker.push(msg)) {
                     msg->release();
                     break;
@@ -246,10 +256,10 @@ void SfizzVstProcessor::processControllerChanges(Vst::IParameterChanges& pc)
         switch (id) {
         default:
             if (id >= kPidMidiCC0 && id <= kPidMidiCCLast) {
-                int ccNumber = id - kPidMidiCC0;
+                auto ccNumber = static_cast<int>(id - kPidMidiCC0);
                 for (uint32 pointIndex = 0; pointIndex < pointCount; ++pointIndex) {
                     if (vq->getPoint(pointIndex, sampleOffset, value) == kResultTrue)
-                        synth.cc(sampleOffset, ccNumber, (int)(0.5 + value * 127.0));
+                        synth.cc(sampleOffset, ccNumber, fastRound(value * 127.0));
                 }
             }
             break;
@@ -257,14 +267,14 @@ void SfizzVstProcessor::processControllerChanges(Vst::IParameterChanges& pc)
         case kPidMidiAftertouch:
             for (uint32 pointIndex = 0; pointIndex < pointCount; ++pointIndex) {
                 if (vq->getPoint(pointIndex, sampleOffset, value) == kResultTrue)
-                    synth.aftertouch(sampleOffset, (int)(0.5 + value * 127.0));
+                    synth.aftertouch(sampleOffset, fastRound(value * 127.0));
             }
             break;
 
         case kPidMidiPitchBend:
             for (uint32 pointIndex = 0; pointIndex < pointCount; ++pointIndex) {
                 if (vq->getPoint(pointIndex, sampleOffset, value) == kResultTrue)
-                    synth.pitchWheel(sampleOffset, (int)(0.5 + value * 16383) - 8192);
+                    synth.pitchWheel(sampleOffset, fastRound(value * 16383) - 8192);
             }
             break;
         }