here marks the commit that I should release on. but instead im gonna redo the ui first because it's terrible on mobile.

CMakeLists.txt

@@ -21,21 +21,6 @@ include(FetchContent)
 option(BUILD_ANDROID "Build for Android" OFF)
 option(BUILD_IOS "Build for iOS" OFF)
 
-# --- Feature Flags ---
-# Default to OFF for mobile to save resources, ON for desktop
-if(BUILD_ANDROID OR BUILD_IOS)
-    option(ENABLE_TEMPO_ESTIMATION "Enable Loop Tempo Estimator for BPM detection" OFF)
-else()
-    option(ENABLE_TEMPO_ESTIMATION "Enable Loop Tempo Estimator for BPM detection" ON)
-endif()
-
-if(ENABLE_TEMPO_ESTIMATION)
-    message(STATUS "Tempo Estimation (Entropy) Enabled")
-    add_compile_definitions(ENABLE_TEMPO_ESTIMATION)
-else()
-    message(STATUS "Tempo Estimation (Entropy) Disabled")
-endif()
-
 find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets Multimedia)
 find_package(Qt6 QUIET COMPONENTS ShaderTools)
 
@@ -103,13 +88,6 @@ else()
     FetchContent_MakeAvailable(fftw3_source)
 endif()
 
-# --- Loop Tempo Estimator ---
-if(ENABLE_TEMPO_ESTIMATION)
-    set(BUILD_TESTS OFF CACHE BOOL "Build tests" FORCE)
-    set(BUILD_VAMP_PLUGIN OFF CACHE BOOL "Build Vamp plugin" FORCE)
-    add_subdirectory(libraries/loop-tempo-estimator)
-endif()
-
 # ==========================================
 # --- ICON GENERATION ---
 # ==========================================
@@ -260,10 +238,6 @@ target_link_libraries(YrCrystals PRIVATE
     ${FFTW_TARGET}
 )
 
-if(ENABLE_TEMPO_ESTIMATION)
-    target_link_libraries(YrCrystals PRIVATE loop-tempo-estimator)
-endif()
-
 if(BUILD_ANDROID)
     target_link_libraries(YrCrystals PRIVATE log m)
     set_property(TARGET YrCrystals PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")

src/AudioEngine.cpp

@@ -6,9 +6,7 @@
 #include <QDebug>
 #include <QDir>
 #include <QMediaDevices>
-#include <QPointer>
 #include <QStandardPaths>
-#include <QThreadPool>
 #include <QUrl>
 #include <QtEndian>
 #include <algorithm>
@@ -19,39 +17,6 @@
 #endif
 #endif
 
-#ifdef ENABLE_TEMPO_ESTIMATION
-#include "LoopTempoEstimator/LoopTempoEstimator.h"
-
-// --- Helper: Memory Reader for BPM ---
-class MemoryAudioReader : public LTE::LteAudioReader {
-public:
-  MemoryAudioReader(const float *data, long long numFrames, int sampleRate)
-      : m_data(data), m_numFrames(numFrames), m_sampleRate(sampleRate) {}
-  double GetSampleRate() const override {
-    return static_cast<double>(m_sampleRate);
-  }
-  long long GetNumSamples() const override { return m_numFrames; }
-  void ReadFloats(float *buffer, long long where,
-                  size_t numFrames) const override {
-    for (size_t i = 0; i < numFrames; ++i) {
-      long long srcIdx = (where + i) * 2;
-      if (srcIdx + 1 < m_numFrames * 2) {
-        float l = m_data[srcIdx];
-        float r = m_data[srcIdx + 1];
-        buffer[i] = (l + r) * 0.5f;
-      } else {
-        buffer[i] = 0.0f;
-      }
-    }
-  }
-
-private:
-  const float *m_data;
-  long long m_numFrames;
-  int m_sampleRate;
-};
-#endif
-
 // =========================================================
 // AudioEngine (Playback) Implementation
 // =========================================================
@@ -279,40 +244,7 @@ void AudioEngine::onFinished() {
   // Notify UI that track is ready to play
   emit trackLoaded(true);
 
-  // Emit early with pcmData-only so analyzer can show spectrum immediately.
-  // The Hilbert task builds a NEW TrackData, so no data race.
   emit trackDataChanged(m_trackData);
-
-  // Run heavy analysis in background thread pool
-  QPointer<AudioEngine> self = this;
-  // Capture pcmData via implicit sharing (cheap refcount bump)
-  QByteArray pcmSnap = newData->pcmData;
-  int sr = newData->sampleRate;
-  QThreadPool::globalInstance()->start([self, pcmSnap, sr]() {
-    if (!self)
-      return;
-
-    const float *rawFloats =
-        reinterpret_cast<const float *>(pcmSnap.constData());
-    long long totalFloats = pcmSnap.size() / sizeof(float);
-    long long totalFrames = totalFloats / 2;
-
-    if (totalFrames <= 0)
-      return;
-
-    // 1. BPM Detection
-#ifdef ENABLE_TEMPO_ESTIMATION
-    MemoryAudioReader reader(rawFloats, totalFrames, sr);
-    auto bpmOpt =
-        LTE::GetBpm(reader, LTE::FalsePositiveTolerance::Lenient, nullptr);
-    float bpm = bpmOpt.has_value() ? static_cast<float>(*bpmOpt) : 0.0f;
-    if (self) {
-      QMetaObject::invokeMethod(self, "analysisReady", Qt::QueuedConnection,
-                                Q_ARG(float, bpm), Q_ARG(float, 1.0f));
-    }
-#endif
-
-  });
 }
 
 void AudioEngine::play() {

src/AudioEngine.h

@@ -172,7 +172,6 @@ signals:
   void playbackFinished();
   void trackLoaded(bool success);
   void positionChanged(float position); // Restored signal
-  void analysisReady(float bpm, float confidence);
   void trackDataChanged(std::shared_ptr<TrackData> data);
 
 private slots:

src/MainWindow.cpp

@@ -87,12 +87,9 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {
   // Analyzer -> UI
   connect(m_analyzer, &AudioAnalyzer::spectrumAvailable, this,
           &MainWindow::onSpectrumAvailable);
-  connect(m_engine, &AudioEngine::analysisReady, this,
-          &MainWindow::onAnalysisReady);
-
   // Settings -> Analyzer
   connect(m_playerPage->settings(), &SettingsWidget::paramsChanged, this,
-          [this](bool, bool, bool, bool, bool, float, float, float,
+          [this](bool, bool, bool, bool, float, float, float, float,
                  int granularity, int detail, float strength) {
             QMetaObject::invokeMethod(
                 m_analyzer, "setSmoothingParams", Qt::QueuedConnection,
@@ -198,13 +195,9 @@ void MainWindow::initUi() {
   connect(set, &SettingsWidget::dspParamsChanged, this,
           &MainWindow::onDspChanged);
   connect(set, &SettingsWidget::binsChanged, this, &MainWindow::onBinsChanged);
-  connect(set, &SettingsWidget::bpmScaleChanged, this,
-          &MainWindow::updateSmoothing);
   connect(set, &SettingsWidget::paramsChanged, this, &MainWindow::saveSettings);
   connect(set, &SettingsWidget::fpsChanged, this, [&](int) { saveSettings(); });
   connect(set, &SettingsWidget::binsChanged, this, &MainWindow::saveSettings);
-  connect(set, &SettingsWidget::bpmScaleChanged, this,
-          &MainWindow::saveSettings);
 
   connect(m_playerPage, &PlayerPage::toggleFullScreen, this,
           &MainWindow::onToggleFullScreen);
@@ -408,13 +401,16 @@ void MainWindow::loadSettings() {
   if (f.open(QIODevice::ReadOnly)) {
     QJsonDocument doc = QJsonDocument::fromJson(f.readAll());
     QJsonObject root = doc.object();
+    float entropy = root.contains("entropy") ? root["entropy"].toDouble(0.0) : 0.0;
+    if (!root["entropyEnabled"].toBool(false))
+      entropy = -100.0f;
     m_playerPage->settings()->setParams(
-        root["glass"].toBool(true), root["focus"].toBool(false),
+        root["glass"].toBool(true),
         root["albumColors"].toBool(false), root["mirrored"].toBool(false),
         root["inverted"].toBool(false), root["bins"].toInt(26),
         root["fps"].toInt(60), root["brightness"].toDouble(1.0),
         root["granularity"].toInt(33), root["detail"].toInt(50),
-        root["strength"].toDouble(0.0), root["bpmScaleIndex"].toInt(2));
+        root["strength"].toDouble(0.0), entropy);
   }
 }
 
@@ -424,7 +420,6 @@ void MainWindow::saveSettings() {
   SettingsWidget *s = m_playerPage->settings();
   QJsonObject root;
   root["glass"] = s->isGlass();
-  root["focus"] = s->isFocus();
   root["albumColors"] = s->isAlbumColors();
   root["mirrored"] = s->isMirrored();
   root["inverted"] = s->isInverted();
@@ -434,7 +429,8 @@ void MainWindow::saveSettings() {
   root["granularity"] = s->getGranularity();
   root["detail"] = s->getDetail();
   root["strength"] = s->getStrength();
-  root["bpmScaleIndex"] = s->getBpmScaleIndex();
+  root["entropyEnabled"] = s->isEntropy();
+  root["entropy"] = s->getEntropy();
   QFile f(QDir(m_settingsDir).filePath(".yrcrystals.json"));
   if (f.open(QIODevice::WriteOnly))
     f.write(QJsonDocument(root).toJson());
@@ -476,25 +472,6 @@ void MainWindow::onTrackLoaded(bool success) {
   }
 }
 
-void MainWindow::onAnalysisReady(float bpm, float confidence) {
-  m_lastBpm = bpm;
-  updateSmoothing();
-}
-
-void MainWindow::updateSmoothing() {
-  if (m_lastBpm <= 0.0f)
-    return;
-  float scale = m_playerPage->settings()->getBpmScale();
-  float effectiveBpm = m_lastBpm * scale;
-  float normalized = std::clamp((effectiveBpm - 60.0f) / 120.0f, 0.0f, 1.0f);
-  float targetStrength = 0.8f * (1.0f - normalized);
-  SettingsWidget *s = m_playerPage->settings();
-  s->setParams(s->isGlass(), s->isFocus(), s->isAlbumColors(), s->isMirrored(),
-               s->isInverted(), s->getBins(), s->getFps(), s->getBrightness(),
-               s->getGranularity(), s->getDetail(), targetStrength,
-               s->getBpmScaleIndex());
-}
-
 void MainWindow::onTrackDoubleClicked(QListWidgetItem *item) {
   loadIndex(m_playlist->row(item));
 }

src/MainWindow.h

@@ -29,8 +29,6 @@ private slots:
     void onTrackFinished();
     void onTrackLoaded(bool success);
     void onTrackDoubleClicked(QListWidgetItem* item);
-    void onAnalysisReady(float bpm, float confidence);
-    void updateSmoothing(); 
     void play();
     void pause();
     void nextTrack();
@@ -78,8 +76,6 @@ private:
     PendingAction m_pendingAction = PendingAction::None;
     QString m_settingsDir;
     
-    float m_lastBpm = 0.0f; 
-    
     // FIX: Use QPointer for both loader and thread to prevent use-after-free
     QPointer<Utils::MetadataLoader> m_metaLoader;
     QPointer<QThread> m_metaThread;

src/PlayerControls.cpp

@@ -133,7 +133,7 @@ SettingsWidget::SettingsWidget(QWidget *parent) : QWidget(parent) {
 
   // Updated Defaults based on user request
   m_checkGlass = createCheck("Glass", true, 0, 0);
-  m_checkFocus = createCheck("Focus", true, 0, 1);
+  m_checkEntropy = createCheck("Entropy", false, 0, 1);
   m_checkAlbumColors = createCheck("Album Colors", false, 1, 0);
   m_checkMirrored = createCheck("Mirrored", true, 1, 1);
   m_checkInverted = createCheck("Invert", false, 2, 0);
@@ -185,25 +185,32 @@ SettingsWidget::SettingsWidget(QWidget *parent) : QWidget(parent) {
   connect(m_sliderStrength, &QSlider::valueChanged, this,
           &SettingsWidget::onSmoothingChanged);
 
-  // BPM Scale Selector
+  // Entropy slider — shown only when Entropy checkbox is checked
-  QHBoxLayout *bpmLayout = new QHBoxLayout();
+  {
-  QLabel *lblBpm = new QLabel("BPM Scale:", this);
+    m_entropyContainer = new QWidget(this);
-  lblBpm->setStyleSheet("color: white; font-weight: bold; border: none; "
+    m_entropyContainer->setStyleSheet("border: none; background: transparent;");
-                        "background: transparent; min-width: 80px;");
+    QHBoxLayout *h = new QHBoxLayout(m_entropyContainer);
+    h->setContentsMargins(0, 0, 0, 0);
+    m_lblEntropy = new QLabel("Entropy: 0.0", this);
+    m_lblEntropy->setStyleSheet("color: white; font-weight: bold; border: none; "
+                                "background: transparent; min-width: 80px;");
+    m_sliderEntropy = new QSlider(Qt::Horizontal, this);
+    m_sliderEntropy->setRange(-150, 150); // -1.5 to 1.5, center detent at 0
+    m_sliderEntropy->setValue(0);
+    m_sliderEntropy->setStyleSheet(
+        "QSlider::handle:horizontal { background: #aaa; width: 24px; margin: "
+        "-10px 0; border-radius: 12px; } QSlider::groove:horizontal { "
+        "background: #444; height: 4px; }");
+    h->addWidget(m_lblEntropy);
+    h->addWidget(m_sliderEntropy);
+    layout->addWidget(m_entropyContainer);
+    m_entropyContainer->setVisible(false);
 
-  m_comboBpmScale = new QComboBox(this);
+    connect(m_sliderEntropy, &QSlider::valueChanged, this,
-  m_comboBpmScale->addItems({"1/1", "1/2", "1/4 (Default)", "1/8", "1/16"});
+            &SettingsWidget::onEntropyChanged);
-  m_comboBpmScale->setCurrentIndex(4); // Default to 1/16
+    connect(m_checkEntropy, &QCheckBox::toggled, m_entropyContainer,
-  m_comboBpmScale->setStyleSheet(
+            &QWidget::setVisible);
-      "QComboBox { background: #444; color: white; border: 1px solid #666; "
+  }
-      "border-radius: 4px; padding: 4px; } QComboBox::drop-down { border: "
-      "none; }");
-  connect(m_comboBpmScale, QOverload<int>::of(&QComboBox::currentIndexChanged),
-          this, &SettingsWidget::onBpmScaleChanged);
-
-  bpmLayout->addWidget(lblBpm);
-  bpmLayout->addWidget(m_comboBpmScale);
-  layout->addLayout(bpmLayout);
 
   QHBoxLayout *padsLayout = new QHBoxLayout();
 
@@ -238,13 +245,12 @@ SettingsWidget::SettingsWidget(QWidget *parent) : QWidget(parent) {
   layout->addLayout(padsLayout);
 }
 
-void SettingsWidget::setParams(bool glass, bool focus, bool albumColors,
+void SettingsWidget::setParams(bool glass, bool albumColors,
                                bool mirrored, bool inverted, int bins, int fps,
                                float brightness, int granularity, int detail,
-                               float strength, int bpmScaleIndex) {
+                               float strength, float entropy) {
   bool oldState = blockSignals(true);
   m_checkGlass->setChecked(glass);
-  m_checkFocus->setChecked(focus);
   m_checkAlbumColors->setChecked(albumColors);
   m_checkMirrored->setChecked(mirrored);
   m_checkInverted->setChecked(inverted);
@@ -268,8 +274,11 @@ void SettingsWidget::setParams(bool glass, bool focus, bool albumColors,
   m_strength = strength;
   m_sliderStrength->setValue(static_cast<int>(strength * 100.0f));
 
-  if (bpmScaleIndex >= 0 && bpmScaleIndex < m_comboBpmScale->count()) {
+  m_checkEntropy->setChecked(entropy > -2.0f);
-    m_comboBpmScale->setCurrentIndex(bpmScaleIndex);
+  if (entropy > -2.0f) {
+    m_entropy = entropy;
+    m_sliderEntropy->setValue(static_cast<int>(entropy * 100.0f));
+    m_lblEntropy->setText(QString("Entropy: %1").arg(entropy, 0, 'f', 1));
   }
 
   blockSignals(oldState);
@@ -279,36 +288,19 @@ void SettingsWidget::setParams(bool glass, bool focus, bool albumColors,
 }
 
 void SettingsWidget::emitParams() {
-  emit paramsChanged(m_checkGlass->isChecked(), m_checkFocus->isChecked(),
+  float entropy = m_checkEntropy->isChecked() ? m_entropy : -100.0f;
+  emit paramsChanged(m_checkGlass->isChecked(),
                      m_checkAlbumColors->isChecked(),
                      m_checkMirrored->isChecked(),
                      m_checkInverted->isChecked(), m_hue, m_contrast,
-                     m_brightness, m_granularity, m_detail, m_strength);
+                     m_brightness, entropy,
+                     m_granularity, m_detail, m_strength);
 }
 
-float SettingsWidget::getBpmScale() const {
+void SettingsWidget::onEntropyChanged(int val) {
-  switch (m_comboBpmScale->currentIndex()) {
+  m_entropy = val / 100.0f;
-  case 0:
+  m_lblEntropy->setText(QString("Entropy: %1").arg(m_entropy, 0, 'f', 1));
-    return 0.25f; // 1/1
+  emitParams();
-  case 1:
-    return 0.5f; // 1/2
-  case 2:
-    return 1.0f; // 1/4 (Default)
-  case 3:
-    return 2.0f; // 1/8
-  case 4:
-    return 4.0f; // 1/16
-  default:
-    return 1.0f;
-  }
-}
-
-int SettingsWidget::getBpmScaleIndex() const {
-  return m_comboBpmScale->currentIndex();
-}
-
-void SettingsWidget::onBpmScaleChanged(int index) {
-  emit bpmScaleChanged(getBpmScale());
 }
 
 void SettingsWidget::onDspPadChanged(float x, float y) {

src/PlayerControls.h

@@ -4,7 +4,6 @@
 #include "CommonWidgets.h"
 #include "VisualizerWidget.h"
 #include <QCheckBox>
-#include <QComboBox>
 #include <QLabel>
 #include <QPushButton>
 #include <QSlider>
@@ -42,7 +41,8 @@ public:
   SettingsWidget(QWidget *parent = nullptr);
 
   bool isGlass() const { return m_checkGlass->isChecked(); }
-  bool isFocus() const { return m_checkFocus->isChecked(); }
+  bool isEntropy() const { return m_checkEntropy->isChecked(); }
+  float getEntropy() const { return m_entropy; }
   bool isAlbumColors() const { return m_checkAlbumColors->isChecked(); }
   bool isMirrored() const { return m_checkMirrored->isChecked(); }
   bool isInverted() const { return m_checkInverted->isChecked(); }
@@ -54,24 +54,19 @@ public:
   int getDetail() const { return m_sliderDetail->value(); }
   float getStrength() const { return m_strength; }
 
-  // Returns the multiplier (e.g., 1.0 for 1/4, 0.5 for 1/2)
+  void setParams(bool glass, bool albumColors, bool mirrored,
-  float getBpmScale() const;
-  int getBpmScaleIndex() const;
-
-  void setParams(bool glass, bool focus, bool albumColors, bool mirrored,
                  bool inverted, int bins, int fps, float brightness,
                  int granularity, int detail, float strength,
-                 int bpmScaleIndex);
+                 float entropy);
 
 signals:
-  void paramsChanged(bool glass, bool focus, bool albumColors, bool mirrored,
+  void paramsChanged(bool glass, bool albumColors, bool mirrored,
                      bool inverted, float hue, float contrast,
-                     float brightness, int granularity, int detail,
+                     float brightness, float entropy,
-                     float strength);
+                     int granularity, int detail, float strength);
   void fpsChanged(int fps);
   void dspParamsChanged(int fft, int hop);
   void binsChanged(int n);
-  void bpmScaleChanged(float scale);
   void closeClicked();
 
 private slots:
@@ -81,11 +76,11 @@ private slots:
   void onBinsChanged(int val);
   void onBrightnessChanged(int val);
   void onSmoothingChanged(int val);
-  void onBpmScaleChanged(int index);
+  void onEntropyChanged(int val);
 
 private:
   QCheckBox *m_checkGlass;
-  QCheckBox *m_checkFocus;
+  QCheckBox *m_checkEntropy;
   QCheckBox *m_checkAlbumColors;
   QCheckBox *m_checkMirrored;
   QCheckBox *m_checkInverted;
@@ -105,7 +100,10 @@ private:
   QSlider *m_sliderStrength;
   QLabel *m_lblStrength;
 
-  QComboBox *m_comboBpmScale;
+  QSlider *m_sliderEntropy;
+  QLabel *m_lblEntropy;
+  QWidget *m_entropyContainer;
+  float m_entropy = 0.0f;
 
   float m_hue = 0.9f;
   float m_contrast = 1.0f;

src/VisualizerWidget.cpp

@@ -44,17 +44,18 @@ void VisualizerWidget::setTargetFps(int fps) {
   m_targetFps = std::max(15, std::min(120, fps));
 }
 
-void VisualizerWidget::setParams(bool glass, bool focus, bool albumColors,
+void VisualizerWidget::setParams(bool glass, bool albumColors,
                                  bool mirrored, bool inverted, float hue,
-                                 float contrast, float brightness) {
+                                 float contrast, float brightness,
+                                 float entropy) {
   m_glass = glass;
-  m_focus = focus;
   m_useAlbumColors = albumColors;
   m_mirrored = mirrored;
   m_inverted = inverted;
   m_hueFactor = hue;
   m_contrast = contrast;
   m_brightness = brightness;
+  m_entropyStrength = entropy;
   update();
 }
 
@@ -86,7 +87,47 @@ QColor VisualizerWidget::applyModifiers(QColor c) {
   return QColor::fromHsvF(c.hsvHueF(), s, v);
 }
 
-// ===== Spectrum Processing (unchanged) =====
+float VisualizerWidget::calculateEntropy(const std::deque<float> &history) {
+  if (history.size() < 4)
+    return 0.0f;
+
+  int N = static_cast<int>(history.size());
+
+  // Forward DFT (O(N²) for N≈30 is ~900 ops — trivial, no FFTW needed)
+  std::vector<std::complex<double>> X(N);
+  for (int k = 0; k < N; ++k) {
+    double re = 0, im = 0;
+    for (int n = 0; n < N; ++n) {
+      double angle = -2.0 * M_PI * k * n / N;
+      re += history[n] * std::cos(angle);
+      im += history[n] * std::sin(angle);
+    }
+    X[k] = {re, im};
+  }
+
+  // Analytic signal: zero negative freqs, double positive freqs
+  for (int k = N / 2 + 1; k < N; ++k)
+    X[k] = 0;
+  for (int k = 1; k < (N + 1) / 2; ++k)
+    X[k] *= 2.0;
+
+  // Inverse DFT — imaginary part only (zero-centered, phase-aligned)
+  float sqSum = 0.0f;
+  for (int n = 0; n < N; ++n) {
+    double im = 0;
+    for (int k = 0; k < N; ++k) {
+      double angle = 2.0 * M_PI * k * n / N;
+      im += X[k].real() * std::sin(angle) + X[k].imag() * std::cos(angle);
+    }
+    im /= N;
+    sqSum += static_cast<float>(im * im);
+  }
+
+  // RMS of zero-centered signal, normalized: 10dB RMS = max chaos
+  return std::clamp(std::sqrt(sqSum / N) / 10.0f, 0.0f, 1.0f);
+}
+
+// ===== Spectrum Processing =====
 
 void VisualizerWidget::updateData(
     const std::vector<AudioAnalyzer::FrameData> &data) {
@@ -171,14 +212,52 @@ void VisualizerWidget::updateData(
     std::vector<float> vertexEnergy(numBins);
     float globalMax = 0.001f;
 
+    bool useEntropy = m_entropyStrength > -2.0f;
+
+    // Pass 1: compute per-bin entropy from output history (self-referencing)
+    std::vector<float> binEntropy(numBins, 0.0f);
+    if (useEntropy) {
+      for (size_t i = 0; i < numBins; ++i)
+        binEntropy[i] = calculateEntropy(bins[i].history);
+    }
+
+    // Find the midpoint — median entropy across all bins
+    float medianEntropy = 0.0f;
+    if (useEntropy) {
+      std::vector<float> sorted = binEntropy;
+      std::nth_element(sorted.begin(), sorted.begin() + numBins / 2,
+                       sorted.end());
+      medianEntropy = sorted[numBins / 2];
+    }
+
+    // Pass 2: apply entropy-relative multiplier and update visual state
     for (size_t i = 0; i < numBins; ++i) {
       auto &bin = bins[i];
       float rawVal = db[i];
       float primaryVal = (i < primaryDb.size()) ? primaryDb[i] : rawVal;
 
-      float responsiveness = 0.2f;
+      float change = rawVal - bin.visualDb;
-      bin.visualDb =
+      if (useEntropy) {
-          (bin.visualDb * (1.0f - responsiveness)) + (rawVal * responsiveness);
+        // Position relative to midpoint: >0 = more stable, <0 = more chaotic
+        float relative = medianEntropy - binEntropy[i];
+        // Slider controls ratio of reward (stable bins) to penalty (chaotic bins)
+        // At 0: equal gains → balanced/neutral. +1.5: all reward. -1.5: all penalty.
+        float base = 1.5f;
+        float rewardGain = base + m_entropyStrength;  // 0..3
+        float penaltyGain = base - m_entropyStrength; // 3..0
+        float gain = (relative >= 0.0f) ? rewardGain : penaltyGain;
+        float multiplier = 1.0f + relative * gain * 2.0f;
+        multiplier = std::clamp(multiplier, 0.05f, 4.0f);
+        bin.visualDb += change * multiplier;
+        // Feed output back into history — the compressor sees its own work
+        bin.history.push_back(bin.visualDb);
+        if (bin.history.size() > 30)
+          bin.history.pop_front();
+      } else {
+        float responsiveness = 0.2f;
+        bin.visualDb =
+            (bin.visualDb * (1.0f - responsiveness)) + (rawVal * responsiveness);
+      }
 
       float patternResp = 0.1f;
       bin.primaryVisualDb = (bin.primaryVisualDb * (1.0f - patternResp)) +
@@ -225,8 +304,9 @@ void VisualizerWidget::updateData(
       if (curr > prev && curr > next) {
         bool leftDominant = (prev > next);
         float sharpness = std::min(curr - prev, curr - next);
+        float entropyFactor = useEntropy ? std::max(0.1f, std::abs(m_entropyStrength)) : 1.0f;
         float peakIntensity =
-            std::clamp(std::pow(sharpness * 10.0f, 0.3f), 0.0f, 1.0f);
+            std::clamp(std::pow(sharpness * 10.0f * entropyFactor, 0.3f), 0.0f, 1.0f);
         float decayBase = 0.65f - std::clamp(sharpness * 3.0f, 0.0f, 0.35f);
 
         auto applyPattern = [&](int dist, bool isBrightSide, int direction) {
@@ -318,7 +398,7 @@ void VisualizerWidget::initialize(QRhiCommandBuffer *cb) {
                                   2048 * 6 * sizeof(float)));
     m_vbuf->create();
 
-    // Uniform buffer: 5 aligned MVP matrices (4 mirror passes + 1 cepstrum)
+    // Uniform buffer: single MVP matrix (mirroring baked into vertices)
     m_ubuf.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic,
                                   QRhiBuffer::UniformBuffer,
                                   m_ubufAlign * 5));
@@ -392,6 +472,34 @@ void VisualizerWidget::render(QRhiCommandBuffer *cb) {
     m_lastBuildH = h;
     if (m_mirrored) {
       buildVertices(w * 0.55f, h / 2);
+      // Mirror into 4 quadrants directly (avoids multi-pass dynamic UBO
+      // issues on Android GPU drivers)
+      {
+        int fillFloats = m_fillVertexCount * 6;
+        std::vector<float> baseFill(m_vertices.begin(),
+                                    m_vertices.begin() + fillFloats);
+        std::vector<float> baseLine(m_vertices.begin() + fillFloats,
+                                    m_vertices.end());
+        m_vertices.clear();
+        auto mir = [](const std::vector<float> &src, std::vector<float> &dst,
+                      float sx, float sy, float tx, float ty) {
+          for (size_t j = 0; j < src.size(); j += 6) {
+            dst.push_back(src[j] * sx + tx);
+            dst.push_back(src[j + 1] * sy + ty);
+            dst.insert(dst.end(), src.begin() + j + 2, src.begin() + j + 6);
+          }
+        };
+        mir(baseFill, m_vertices, 1, 1, 0, 0);
+        mir(baseFill, m_vertices, -1, 1, (float)w, 0);
+        mir(baseFill, m_vertices, 1, -1, 0, (float)h);
+        mir(baseFill, m_vertices, -1, -1, (float)w, (float)h);
+        m_fillVertexCount *= 4;
+        mir(baseLine, m_vertices, 1, 1, 0, 0);
+        mir(baseLine, m_vertices, -1, 1, (float)w, 0);
+        mir(baseLine, m_vertices, 1, -1, 0, (float)h);
+        mir(baseLine, m_vertices, -1, -1, (float)w, (float)h);
+        m_lineVertexCount *= 4;
+      }
       buildCepstrumVertices(w, h);
     } else {
       buildVertices(w, h);
@@ -399,8 +507,6 @@ void VisualizerWidget::render(QRhiCommandBuffer *cb) {
     }
   }
 
-  int numPasses = m_mirrored ? 4 : 1;
-
   // Prepare resource updates
   QRhiResourceUpdateBatch *u = m_rhi->nextResourceUpdateBatch();
 
@@ -421,44 +527,12 @@ void VisualizerWidget::render(QRhiCommandBuffer *cb) {
     }
   }
 
-  // Upload MVP matrices
+  // Single full-screen ortho MVP — mirroring is baked into vertex positions
   QMatrix4x4 correction = m_rhi->clipSpaceCorrMatrix();
-
+  QMatrix4x4 proj;
-  for (int i = 0; i < numPasses; i++) {
+  proj.ortho(0, (float)w, (float)h, 0, -1, 1);
-    QMatrix4x4 proj;
+  QMatrix4x4 mvp = correction * proj;
-    proj.ortho(0, (float)w, (float)h, 0, -1, 1);
+  u->updateDynamicBuffer(m_ubuf.get(), 0, 64, mvp.constData());
-
-    if (m_mirrored) {
-      switch (i) {
-      case 0: break;
-      case 1:
-        proj.translate(w, 0, 0);
-        proj.scale(-1, 1, 1);
-        break;
-      case 2:
-        proj.translate(0, h, 0);
-        proj.scale(1, -1, 1);
-        break;
-      case 3:
-        proj.translate(w, h, 0);
-        proj.scale(-1, -1, 1);
-        break;
-      }
-    }
-
-    QMatrix4x4 mvp = correction * proj;
-    u->updateDynamicBuffer(m_ubuf.get(), i * m_ubufAlign, 64,
-                           mvp.constData());
-  }
-
-  // Upload full-screen ortho MVP for cepstrum (slot 4)
-  if (m_mirrored && m_cepstrumVertexCount > 0) {
-    QMatrix4x4 cepProj;
-    cepProj.ortho(0, (float)w, (float)h, 0, -1, 1);
-    QMatrix4x4 cepMvp = correction * cepProj;
-    u->updateDynamicBuffer(m_ubuf.get(), 4 * m_ubufAlign, 64,
-                           cepMvp.constData());
-  }
 
   // Begin render pass
   cb->beginPass(renderTarget(), QColor(0, 0, 0, 255), {1.0f, 0}, u);
@@ -466,30 +540,25 @@ void VisualizerWidget::render(QRhiCommandBuffer *cb) {
                    (float)outputSize.height()});
 
   const QRhiCommandBuffer::VertexInput vbufBinding(m_vbuf.get(), 0);
+  QRhiCommandBuffer::DynamicOffset dynOfs(0, 0);
 
-  for (int i = 0; i < numPasses; i++) {
+  if (m_fillVertexCount > 0) {
-    QRhiCommandBuffer::DynamicOffset dynOfs(0, quint32(i * m_ubufAlign));
+    cb->setGraphicsPipeline(m_fillPipeline.get());
-
+    cb->setShaderResources(m_srb.get(), 1, &dynOfs);
-    if (m_fillVertexCount > 0) {
+    cb->setVertexInput(0, 1, &vbufBinding);
-      cb->setGraphicsPipeline(m_fillPipeline.get());
+    cb->draw(m_fillVertexCount);
-      cb->setShaderResources(m_srb.get(), 1, &dynOfs);
-      cb->setVertexInput(0, 1, &vbufBinding);
-      cb->draw(m_fillVertexCount);
-    }
-
-    if (m_lineVertexCount > 0) {
-      cb->setGraphicsPipeline(m_linePipeline.get());
-      cb->setShaderResources(m_srb.get(), 1, &dynOfs);
-      cb->setVertexInput(0, 1, &vbufBinding);
-      cb->draw(m_lineVertexCount, 1, m_fillVertexCount, 0);
-    }
   }
 
-  // --- Cepstral Thread (single full-screen pass, after mirror loop) ---
+  if (m_lineVertexCount > 0) {
-  if (m_mirrored && m_cepstrumVertexCount > 0) {
-    QRhiCommandBuffer::DynamicOffset cepOfs(0, quint32(4 * m_ubufAlign));
     cb->setGraphicsPipeline(m_linePipeline.get());
-    cb->setShaderResources(m_srb.get(), 1, &cepOfs);
+    cb->setShaderResources(m_srb.get(), 1, &dynOfs);
+    cb->setVertexInput(0, 1, &vbufBinding);
+    cb->draw(m_lineVertexCount, 1, m_fillVertexCount, 0);
+  }
+
+  if (m_cepstrumVertexCount > 0) {
+    cb->setGraphicsPipeline(m_linePipeline.get());
+    cb->setShaderResources(m_srb.get(), 1, &dynOfs);
     cb->setVertexInput(0, 1, &vbufBinding);
     cb->draw(m_cepstrumVertexCount, 1, m_fillVertexCount + m_lineVertexCount, 0);
   }

src/VisualizerWidget.h

@@ -15,7 +15,7 @@ class VisualizerWidget : public QRhiWidget {
 public:
     VisualizerWidget(QWidget* parent = nullptr);
     void updateData(const std::vector<AudioAnalyzer::FrameData>& data);
-    void setParams(bool glass, bool focus, bool albumColors, bool mirrored, bool inverted, float hue, float contrast, float brightness);
+    void setParams(bool glass, bool albumColors, bool mirrored, bool inverted, float hue, float contrast, float brightness, float entropy);
     void setAlbumPalette(const std::vector<QColor>& palette);
     void setNumBins(int n);
     void setTargetFps(int fps);
@@ -39,6 +39,7 @@ private:
         float brightMod = 0.0f;
         float alphaMod = 0.0f;
         QColor cachedColor;
+        std::deque<float> history;
     };
 
     struct ChannelState {
@@ -57,7 +58,6 @@ private:
     QColor m_unifiedColor = Qt::white;
 
     bool m_glass = true;
-    bool m_focus = false;
     bool m_useAlbumColors = false;
     bool m_mirrored = false;
     bool m_inverted = false;
@@ -91,6 +91,9 @@ private:
     int m_cepstrumVertexCount = 0;
     void buildCepstrumVertices(int w, int h);
 
+    float m_entropyStrength = -100.0f; // <-2 = disabled, -1.5..1.5 = enabled
+
     float getX(float freq);
+    float calculateEntropy(const std::deque<float>& history);
     QColor applyModifiers(QColor c);
 };

src/complex_frames.cpp

@@ -103,12 +103,13 @@ void RealtimeHilbert::reinit(size_t fft_size) {
     }
 
     // Create plans for Left Channel
-    m_plan_forward_L = fftw_plan_dft_r2c_1d(m_fft_size, m_fft_input_real_L, m_fft_output_spectrum_L, FFTW_ESTIMATE);
+    int n = static_cast<int>(m_fft_size);
-    m_plan_backward_L = fftw_plan_dft_1d(m_fft_size, m_ifft_input_spectrum_L, m_ifft_output_complex_L, FFTW_BACKWARD, FFTW_ESTIMATE);
+    m_plan_forward_L = fftw_plan_dft_r2c_1d(n, m_fft_input_real_L, m_fft_output_spectrum_L, FFTW_ESTIMATE);
+    m_plan_backward_L = fftw_plan_dft_1d(n, m_ifft_input_spectrum_L, m_ifft_output_complex_L, FFTW_BACKWARD, FFTW_ESTIMATE);
 
     // Create plans for Right Channel
-    m_plan_forward_R = fftw_plan_dft_r2c_1d(m_fft_size, m_fft_input_real_R, m_fft_output_spectrum_R, FFTW_ESTIMATE);
+    m_plan_forward_R = fftw_plan_dft_r2c_1d(n, m_fft_input_real_R, m_fft_output_spectrum_R, FFTW_ESTIMATE);
-    m_plan_backward_R = fftw_plan_dft_1d(m_fft_size, m_ifft_input_spectrum_R, m_ifft_output_complex_R, FFTW_BACKWARD, FFTW_ESTIMATE);
+    m_plan_backward_R = fftw_plan_dft_1d(n, m_ifft_input_spectrum_R, m_ifft_output_complex_R, FFTW_BACKWARD, FFTW_ESTIMATE);
 
     if (!m_plan_forward_L || !m_plan_backward_L || !m_plan_forward_R || !m_plan_backward_R) {
         cleanup();