v1.1.3: Brickwall limiter + double-click reset on all knobs

- Output brickwall limiter (0 dB ceiling) with toggle in master row
- All sliders reset to default on double-click:
  Master gain → 0 dB, Freq → 1000 Hz, Gain → 0 dB, Q → 1.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Source/NodeParameterPanel.cpp

@@ -5,11 +5,14 @@ NodeParameterPanel::NodeParameterPanel()
 {
     setupSlider (freqSlider, freqLabel, 20.0, 20000.0, 1.0, " Hz");
     freqSlider.setSkewFactorFromMidPoint (1000.0);
+    freqSlider.setDoubleClickReturnValue (true, 1000.0);
 
     setupSlider (gainSlider, gainLabel, -24.0, 24.0, 0.1, " dB");
+    gainSlider.setDoubleClickReturnValue (true, 0.0);
 
     setupSlider (qSlider, qLabel, 0.1, 18.0, 0.01, "");
     qSlider.setSkewFactorFromMidPoint (1.0);
+    qSlider.setDoubleClickReturnValue (true, 1.0);
     qSlider.getProperties().set (InstaLPEQLookAndFeel::knobTypeProperty, "dark");
 
     typeSelector.addItem ("Peak", 1);

Source/PluginEditor.cpp

@@ -48,12 +48,22 @@ InstaLPEQEditor::InstaLPEQEditor (InstaLPEQProcessor& p)
         int sel = qualitySelector.getSelectedId();
         int order = sel + 8;  // 1->9, 2->10, 3->11, 4->12, 5->13, 6->14
         processor.setQuality (order);
+
+        if (sel <= 2)  // 512 or 1024
+            qualityWarning.setText ("Low freq accuracy reduced", juce::dontSendNotification);
+        else
+            qualityWarning.setText ("", juce::dontSendNotification);
     };
     addAndMakeVisible (qualitySelector);
     qualityLabel.setFont (customLookAndFeel.getMediumFont (13.0f));
     qualityLabel.setJustificationType (juce::Justification::centredRight);
     addAndMakeVisible (qualityLabel);
 
+    qualityWarning.setFont (customLookAndFeel.getRegularFont (11.0f));
+    qualityWarning.setColour (juce::Label::textColourId, juce::Colour (0xffff6644));
+    qualityWarning.setJustificationType (juce::Justification::centredRight);
+    addAndMakeVisible (qualityWarning);
+
     // EQ curve
     curveDisplay.setListener (this);
     addAndMakeVisible (curveDisplay);
@@ -68,11 +78,20 @@ InstaLPEQEditor::InstaLPEQEditor (InstaLPEQProcessor& p)
     masterGainSlider.setRange (-24.0, 24.0, 0.1);
     masterGainSlider.setValue (0.0);
     masterGainSlider.setTextValueSuffix (" dB");
+    masterGainSlider.setDoubleClickReturnValue (true, 0.0);
     addAndMakeVisible (masterGainSlider);
     masterGainLabel.setFont (customLookAndFeel.getMediumFont (13.0f));
     masterGainLabel.setJustificationType (juce::Justification::centred);
     addAndMakeVisible (masterGainLabel);
 
+    // Limiter toggle
+    limiterToggle.setToggleState (processor.limiterEnabled.load(), juce::dontSendNotification);
+    addAndMakeVisible (limiterToggle);
+    limiterLabel.setFont (customLookAndFeel.getMediumFont (13.0f));
+    limiterLabel.setColour (juce::Label::textColourId, InstaLPEQLookAndFeel::textSecondary);
+    limiterLabel.setJustificationType (juce::Justification::centred);
+    addAndMakeVisible (limiterLabel);
+
     // Sizing
     constrainer.setMinimumSize (700, 450);
     constrainer.setMaximumSize (1920, 1080);
@@ -144,11 +163,18 @@ void InstaLPEQEditor::resized()
     masterGainLabel.setBounds (labelArea);
     masterGainSlider.setBounds (masterArea.removeFromLeft (masterH));
 
+    // Limiter toggle next to master gain
+    limiterLabel.setFont (customLookAndFeel.getMediumFont (std::max (11.0f, 14.0f * scale)));
+    limiterLabel.setBounds (masterArea.removeFromLeft (55));
+    limiterToggle.setBounds (masterArea.removeFromLeft (40));
+
     // Quality selector on the right side of master row
     qualityLabel.setFont (customLookAndFeel.getMediumFont (std::max (11.0f, 14.0f * scale)));
     auto qLabelArea = masterArea.removeFromRight (30);
     qualityLabel.setBounds (qLabelArea);
     qualitySelector.setBounds (masterArea.removeFromRight ((int) (130 * scale)).reduced (2, (masterH - 24) / 2));
+    qualityWarning.setFont (customLookAndFeel.getRegularFont (std::max (9.0f, 11.0f * scale)));
+    qualityWarning.setBounds (masterArea.removeFromRight ((int) (170 * scale)));
 
     // Node parameter panel (15% of remaining height)
     int nodePanelH = (int) (bounds.getHeight() * 0.18f);
@@ -162,9 +188,10 @@ void InstaLPEQEditor::resized()
 
 void InstaLPEQEditor::timerCallback()
 {
-    // Sync bypass
+    // Sync bypass & limiter
     processor.bypassed.store (bypassToggle.getToggleState());
     processor.masterGainDb.store ((float) masterGainSlider.getValue());
+    processor.limiterEnabled.store (limiterToggle.getToggleState());
 
     // Update display with latest magnitude response
     auto magDb = processor.getFIREngine().getMagnitudeResponseDb();

Source/PluginEditor.h

@@ -39,16 +39,19 @@ private:
     NodeParameterPanel nodePanel;
 
     juce::Label titleLabel { {}, "INSTALPEQ" };
-    juce::Label versionLabel { {}, "v1.1.2" };
+    juce::Label versionLabel { {}, "v1.1.3" };
     juce::ToggleButton bypassToggle;
     juce::Label bypassLabel { {}, "BYPASS" };
 
     juce::TextButton newBandButton { "NEW BAND" };
     juce::ComboBox qualitySelector;
     juce::Label qualityLabel { {}, "FIR" };
+    juce::Label qualityWarning { {}, "" };
 
     juce::Slider masterGainSlider;
     juce::Label masterGainLabel { {}, "MASTER" };
+    juce::ToggleButton limiterToggle;
+    juce::Label limiterLabel { {}, "LIMITER" };
 
     juce::ComponentBoundsConstrainer constrainer;
 

Source/PluginProcessor.cpp

@@ -28,6 +28,9 @@ void InstaLPEQProcessor::prepareToPlay (double sampleRate, int samplesPerBlock)
 
     juce::dsp::ProcessSpec spec { sampleRate, (juce::uint32) samplesPerBlock, 2 };
     convolution.prepare (spec);
+    limiter.prepare (spec);
+    limiter.setThreshold (0.0f);
+    limiter.setRelease (50.0f);
 
     firEngine.start (sampleRate);
     updateFIR();
@@ -67,6 +70,14 @@ void InstaLPEQProcessor::processBlock (juce::AudioBuffer<float>& buffer, juce::M
     float gain = juce::Decibels::decibelsToGain (masterGainDb.load());
     if (std::abs (gain - 1.0f) > 0.001f)
         buffer.applyGain (gain);
+
+    // Brickwall limiter (0 dB ceiling)
+    if (limiterEnabled.load())
+    {
+        juce::dsp::AudioBlock<float> limBlock (buffer);
+        juce::dsp::ProcessContextReplacing<float> limContext (limBlock);
+        limiter.process (limContext);
+    }
 }
 
 // ============================================================
@@ -141,6 +152,7 @@ void InstaLPEQProcessor::getStateInformation (juce::MemoryBlock& destData)
     juce::XmlElement xml ("InstaLPEQ");
     xml.setAttribute ("bypass", bypassed.load());
     xml.setAttribute ("masterGain", (double) masterGainDb.load());
+    xml.setAttribute ("limiter", limiterEnabled.load());
 
     auto currentBands = getBands();
     for (int i = 0; i < (int) currentBands.size(); ++i)
@@ -164,6 +176,7 @@ void InstaLPEQProcessor::setStateInformation (const void* data, int sizeInBytes)
 
     bypassed.store (xml->getBoolAttribute ("bypass", false));
     masterGainDb.store ((float) xml->getDoubleAttribute ("masterGain", 0.0));
+    limiterEnabled.store (xml->getBoolAttribute ("limiter", true));
 
     std::vector<EQBand> loadedBands;
     for (auto* bandXml : xml->getChildIterator())

Source/PluginProcessor.h

@@ -43,6 +43,7 @@ public:
     // Settings
     std::atomic<bool> bypassed { false };
     std::atomic<float> masterGainDb { 0.0f };
+    std::atomic<bool> limiterEnabled { true };
 
     void setQuality (int fftOrder);
 
@@ -55,6 +56,7 @@ private:
 
     FIREngine firEngine;
     juce::dsp::Convolution convolution;
+    juce::dsp::Limiter<float> limiter;
 
     double currentSampleRate = 44100.0;
     int currentBlockSize = 512;