Initial release — InstaShadow mastering compressor v1.0

Dual-stage compressor (optical + VCA) with output transformer saturation.
- Port-Hamiltonian T4B opto-cell model with implicit trapezoidal integration
- Feed-forward VCA with 7 ratios, 6 attack/release presets, Dual release mode
- 3 transformer types (Nickel/Iron/Steel) with 4x oversampled waveshaping
- Analog-style needle VU meters, horizontal GR meters
- Sidechain HPF, stereo link, independent section bypass
- Full state save/restore, CI/CD for Windows/macOS/Linux

Source/DiscretePanel.cpp

@@ -0,0 +1,129 @@
+#include "DiscretePanel.h"
+
+DiscretePanel::DiscretePanel()
+{
+    titleLabel.setText ("DISCRETE", juce::dontSendNotification);
+    titleLabel.setJustificationType (juce::Justification::centred);
+    titleLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textPrimary);
+    addAndMakeVisible (titleLabel);
+
+    auto setupKnob = [this] (juce::Slider& knob, juce::Label& label, const juce::String& name,
+                              double min, double max, double def, const juce::String& suffix)
+    {
+        knob.setSliderStyle (juce::Slider::RotaryHorizontalVerticalDrag);
+        knob.setTextBoxStyle (juce::Slider::TextBoxBelow, false, 60, 14);
+        knob.setRange (min, max);
+        knob.setValue (def);
+        knob.setTextValueSuffix (suffix);
+        knob.getProperties().set (InstaShadowLookAndFeel::knobTypeProperty, "orange");
+        addAndMakeVisible (knob);
+
+        label.setText (name, juce::dontSendNotification);
+        label.setJustificationType (juce::Justification::centred);
+        label.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textSecondary);
+        addAndMakeVisible (label);
+    };
+
+    setupKnob (thresholdKnob, threshLabel, "Threshold", -40.0, 0.0, -20.0, " dB");
+    setupKnob (gainKnob, gainLabel, "Gain", 0.0, 20.0, 0.0, " dB");
+
+    ratioBox.addItem ("1.2:1", 1);
+    ratioBox.addItem ("2:1", 2);
+    ratioBox.addItem ("3:1", 3);
+    ratioBox.addItem ("4:1", 4);
+    ratioBox.addItem ("6:1", 5);
+    ratioBox.addItem ("10:1", 6);
+    ratioBox.addItem ("Flood", 7);
+    ratioBox.setSelectedId (2);
+    addAndMakeVisible (ratioBox);
+    ratioLabel.setText ("Ratio", juce::dontSendNotification);
+    ratioLabel.setJustificationType (juce::Justification::centred);
+    ratioLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textSecondary);
+    addAndMakeVisible (ratioLabel);
+
+    attackBox.addItem ("0.1 ms", 1);
+    attackBox.addItem ("0.5 ms", 2);
+    attackBox.addItem ("1 ms", 3);
+    attackBox.addItem ("5 ms", 4);
+    attackBox.addItem ("10 ms", 5);
+    attackBox.addItem ("30 ms", 6);
+    attackBox.setSelectedId (3);
+    addAndMakeVisible (attackBox);
+    attackLabel.setText ("Attack", juce::dontSendNotification);
+    attackLabel.setJustificationType (juce::Justification::centred);
+    attackLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textSecondary);
+    addAndMakeVisible (attackLabel);
+
+    releaseBox.addItem ("100 ms", 1);
+    releaseBox.addItem ("250 ms", 2);
+    releaseBox.addItem ("500 ms", 3);
+    releaseBox.addItem ("800 ms", 4);
+    releaseBox.addItem ("1.2 s", 5);
+    releaseBox.addItem ("Dual", 6);
+    releaseBox.setSelectedId (3);
+    addAndMakeVisible (releaseBox);
+    releaseLabel.setText ("Release", juce::dontSendNotification);
+    releaseLabel.setJustificationType (juce::Justification::centred);
+    releaseLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textSecondary);
+    addAndMakeVisible (releaseLabel);
+
+    bypassToggle.setButtonText ("");
+    addAndMakeVisible (bypassToggle);
+    bypassLabel.setText ("Bypass", juce::dontSendNotification);
+    bypassLabel.setJustificationType (juce::Justification::centred);
+    bypassLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textSecondary);
+    addAndMakeVisible (bypassLabel);
+}
+
+void DiscretePanel::resized()
+{
+    auto bounds = getLocalBounds().reduced (4);
+    titleLabel.setBounds (bounds.removeFromTop (18));
+
+    int availH = bounds.getHeight() - 22;  // reserve for bypass
+
+    // Top: 2 knobs stacked vertically (~55%)
+    int knobSectionH = (int) (availH * 0.55f);
+    int singleKnobH = knobSectionH / 2;
+
+    auto k1 = bounds.removeFromTop (singleKnobH);
+    thresholdKnob.setBounds (k1.withTrimmedBottom (14).reduced (4, 0));
+    threshLabel.setBounds (k1.getX(), k1.getBottom() - 14, k1.getWidth(), 14);
+
+    auto k2 = bounds.removeFromTop (singleKnobH);
+    gainKnob.setBounds (k2.withTrimmedBottom (14).reduced (4, 0));
+    gainLabel.setBounds (k2.getX(), k2.getBottom() - 14, k2.getWidth(), 14);
+
+    // Gap between knobs and combos
+    bounds.removeFromTop (6);
+
+    // Middle: 3 combos stacked (~30%)
+    int comboSectionH = (int) (availH * 0.30f);
+    int comboH = comboSectionH / 3;
+
+    auto r1 = bounds.removeFromTop (comboH);
+    ratioLabel.setBounds (r1.removeFromLeft (r1.getWidth() / 3));
+    ratioBox.setBounds (r1.reduced (2, 1));
+
+    auto r2 = bounds.removeFromTop (comboH);
+    attackLabel.setBounds (r2.removeFromLeft (r2.getWidth() / 3));
+    attackBox.setBounds (r2.reduced (2, 1));
+
+    auto r3 = bounds.removeFromTop (comboH);
+    releaseLabel.setBounds (r3.removeFromLeft (r3.getWidth() / 3));
+    releaseBox.setBounds (r3.reduced (2, 1));
+
+    // Bottom: bypass
+    auto bpRow = bounds;
+    bypassLabel.setBounds (bpRow.removeFromLeft (bpRow.getWidth() / 2));
+    bypassToggle.setBounds (bpRow.reduced (4, 2));
+}
+
+void DiscretePanel::paint (juce::Graphics& g)
+{
+    auto bounds = getLocalBounds().toFloat();
+    g.setColour (InstaShadowLookAndFeel::bgMedium.withAlpha (0.5f));
+    g.fillRoundedRectangle (bounds, 4.0f);
+    g.setColour (InstaShadowLookAndFeel::bgLight.withAlpha (0.3f));
+    g.drawRoundedRectangle (bounds, 4.0f, 1.0f);
+}