diff --git a/src/sfizz/FlexEnvelope.cpp b/src/sfizz/FlexEnvelope.cpp
index ae06c022..2ae0e04a 100644
--- a/src/sfizz/FlexEnvelope.cpp
+++ b/src/sfizz/FlexEnvelope.cpp
@@ -57,6 +57,7 @@ struct FlexEnvelope::Impl {
     void process(absl::Span<float> out);
     bool advanceToStage(unsigned stageNumber);
     bool advanceToNextStage();
+    void updateCurrentTimeAndLevel();
 };
 
 FlexEnvelope::FlexEnvelope(Resources &resources)
@@ -97,18 +98,8 @@ void FlexEnvelope::start(unsigned triggerDelay)
     const FlexEGDescription& desc = *impl.desc_;
 
     impl.delayFramesLeft_ = triggerDelay;
-
-    FlexEGPoint point;
-    if (!desc.points.empty())
-        point = desc.points[0];
-
-    //
-    impl.stageSourceLevel_ = 0.0;
-    impl.stageTargetLevel_ = point.level;
-    impl.stageTime_ = point.time;
-    impl.stageSustained_ = desc.sustain == 0;
-    impl.stageCurve_ = &point.curve();
     impl.currentFramesUntilRelease_ = absl::nullopt;
+    impl.advanceToStage(0);
 }
 
 void FlexEnvelope::setFreeRunning(bool freeRunning)
@@ -172,6 +163,10 @@ void FlexEnvelope::Impl::process(absl::Span<float> out)
     const FlexEGDescription& desc = *desc_;
     size_t numFrames = out.size();
     const float samplePeriod = samplePeriod_;
+
+    if (desc.dynamic)
+        updateCurrentTimeAndLevel();
+
     // Skip the initial delay, for frame-accurate trigger
     size_t skipFrames = std::min(numFrames, delayFramesLeft_);
     if (skipFrames > 0) {
@@ -266,12 +261,11 @@ bool FlexEnvelope::Impl::advanceToStage(unsigned stageNumber)
 
     const FlexEGPoint& point = desc.points[stageNumber];
     stageSourceLevel_ = currentLevel_;
-    stageTargetLevel_ = point.getLevel(midiState);
-    stageTime_ = point.getTime(midiState);
+    currentTime_ = 0.0f;
+    updateCurrentTimeAndLevel();
     stageSustained_ = int(stageNumber) == desc.sustain;
     stageCurve_ = &point.curve();
 
-    currentTime_ = 0;
     return true;
 };
 
@@ -280,4 +274,16 @@ bool FlexEnvelope::Impl::advanceToNextStage()
     return advanceToStage(currentStageNumber_ + 1);
 }
 
+void FlexEnvelope::Impl::updateCurrentTimeAndLevel()
+{
+    const FlexEGDescription& desc = *desc_;
+    if (currentStageNumber_ >= desc.points.size())
+        return;
+
+    const FlexEGPoint& point = desc.points[currentStageNumber_];
+    const MidiState& midiState = resources_->getMidiState();
+    stageTargetLevel_ = point.getLevel(midiState);
+    stageTime_ = point.getTime(midiState);
+}
+
 } // namespace sfz
diff --git a/src/sfizz/FlexEnvelope.h b/src/sfizz/FlexEnvelope.h
index a72d280f..c33bf751 100644
--- a/src/sfizz/FlexEnvelope.h
+++ b/src/sfizz/FlexEnvelope.h
@@ -5,6 +5,7 @@
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
 #pragma once
+#include "MidiState.h"
 #include <absl/types/span.h>
 #include <memory>
 
diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index 1e200b58..46b9f52d 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -70,7 +70,7 @@ Synth::Impl::Impl()
     MidiState& midiState = resources_.getMidiState();
     genController_.reset(new ControllerSource(resources_, voiceManager_));
     genLFO_.reset(new LFOSource(voiceManager_));
-    genFlexEnvelope_.reset(new FlexEnvelopeSource(voiceManager_));
+    genFlexEnvelope_.reset(new FlexEnvelopeSource(voiceManager_, midiState));
     genADSREnvelope_.reset(new ADSREnvelopeSource(voiceManager_, midiState));
     genChannelAftertouch_.reset(new ChannelAftertouchSource(voiceManager_, midiState));
     genPolyAftertouch_.reset(new PolyAftertouchSource(voiceManager_, midiState));
diff --git a/src/sfizz/modulations/sources/FlexEnvelope.cpp b/src/sfizz/modulations/sources/FlexEnvelope.cpp
index b3e85cfc..1a2698ad 100644
--- a/src/sfizz/modulations/sources/FlexEnvelope.cpp
+++ b/src/sfizz/modulations/sources/FlexEnvelope.cpp
@@ -14,9 +14,10 @@
 
 namespace sfz {
 
-FlexEnvelopeSource::FlexEnvelopeSource(VoiceManager& manager)
-    : voiceManager_(manager)
+FlexEnvelopeSource::FlexEnvelopeSource(VoiceManager& manager, MidiState& midiState)
+    : voiceManager_(manager), midiState_(midiState)
 {
+
 }
 
 void FlexEnvelopeSource::init(const ModKey& sourceKey, NumericId<Voice> voiceId, unsigned delay)
diff --git a/src/sfizz/modulations/sources/FlexEnvelope.h b/src/sfizz/modulations/sources/FlexEnvelope.h
index 81b7a2f7..60cd5b14 100644
--- a/src/sfizz/modulations/sources/FlexEnvelope.h
+++ b/src/sfizz/modulations/sources/FlexEnvelope.h
@@ -7,13 +7,14 @@
 #pragma once
 #include "../ModGenerator.h"
 #include "../../VoiceManager.h"
+#include "../../MidiState.h"
 
 namespace sfz {
 class Synth;
 
 class FlexEnvelopeSource : public ModGenerator {
 public:
-    explicit FlexEnvelopeSource(VoiceManager& manager);
+    explicit FlexEnvelopeSource(VoiceManager& manager, MidiState& midiState);
     void init(const ModKey& sourceKey, NumericId<Voice> voiceId, unsigned delay) override;
     void release(const ModKey& sourceKey, NumericId<Voice> voiceId, unsigned delay) override;
     void cancelRelease(const ModKey& sourceKey, NumericId<Voice> voiceId, unsigned delay) override;
@@ -21,6 +22,7 @@ public:
 
 private:
     VoiceManager& voiceManager_;
+    MidiState& midiState_;
 };
 
 } // namespace sfz