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‎.gitignore

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**/.DS_Store
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**/Builds
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**/JuceLibraryCode
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**/*.filtergraph
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‎Chapter Code/Chapter 10/Delay.jucer

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<?xml version="1.0" encoding="UTF-8"?>
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<JUCERPROJECT id="baUV92" name="Delay" projectType="audioplug" useAppConfig="0"
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addUsingNamespaceToJuceHeader="0" jucerFormatVersion="1" pluginFormats="buildAU,buildAUv3,buildStandalone,buildVST3"
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displaySplashScreen="0" pluginCode="Dlay" cppLanguageStandard="20">
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<MAINGROUP id="klP2XS" name="Delay">
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<GROUP id="{9B6AAD8A-A1DA-3D3C-2B9A-8DB65E27ED34}" name="Source">
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<FILE id="Aogs5S" name="Parameters.cpp" compile="1" resource="0" file="Source/Parameters.cpp"/>
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<FILE id="Bc3PFm" name="Parameters.h" compile="0" resource="0" file="Source/Parameters.h"/>
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<FILE id="r0sBSj" name="PluginEditor.cpp" compile="1" resource="0"
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file="Source/PluginEditor.cpp"/>
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<FILE id="jvM2im" name="PluginEditor.h" compile="0" resource="0" file="Source/PluginEditor.h"/>
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<FILE id="U9wlr4" name="PluginProcessor.cpp" compile="1" resource="0"
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file="Source/PluginProcessor.cpp"/>
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<FILE id="CcoJws" name="PluginProcessor.h" compile="0" resource="0"
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file="Source/PluginProcessor.h"/>
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<FILE id="WTkUQq" name="RotaryKnob.cpp" compile="1" resource="0" file="Source/RotaryKnob.cpp"/>
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<FILE id="bCTGrx" name="RotaryKnob.h" compile="0" resource="0" file="Source/RotaryKnob.h"/>
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</GROUP>
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</MAINGROUP>
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<MODULES>
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<MODULE id="juce_audio_basics" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_audio_devices" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_audio_formats" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_audio_plugin_client" showAllCode="1" useLocalCopy="0"
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useGlobalPath="1"/>
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<MODULE id="juce_audio_processors" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_audio_utils" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_core" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_data_structures" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_dsp" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_events" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_graphics" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_gui_basics" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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<MODULE id="juce_gui_extra" showAllCode="1" useLocalCopy="0" useGlobalPath="1"/>
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</MODULES>
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<JUCEOPTIONS JUCE_STRICT_REFCOUNTEDPOINTER="1" JUCE_VST3_CAN_REPLACE_VST2="0"/>
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<EXPORTFORMATS>
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<VS2022 targetFolder="Builds/VisualStudio2022">
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<CONFIGURATIONS>
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<CONFIGURATION isDebug="1" name="Debug" targetName="Delay" enablePluginBinaryCopyStep="1"
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winWarningLevel="4"/>
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<CONFIGURATION isDebug="0" name="Release" targetName="Delay"/>
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</CONFIGURATIONS>
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<MODULEPATHS>
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<MODULEPATH id="juce_audio_basics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_devices" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_formats" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_plugin_client" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_processors" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_utils" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_core" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_data_structures" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_events" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_graphics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_gui_basics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_gui_extra" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_dsp" path="../../JUCE/modules"/>
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</MODULEPATHS>
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</VS2022>
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<XCODE_IPHONE targetFolder="Builds/iOS">
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<CONFIGURATIONS>
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<CONFIGURATION isDebug="1" name="Debug" targetName="Delay" recommendedWarnings="LLVM"/>
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<CONFIGURATION isDebug="0" name="Release" targetName="Delay"/>
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</CONFIGURATIONS>
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<MODULEPATHS>
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<MODULEPATH id="juce_audio_basics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_devices" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_formats" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_plugin_client" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_processors" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_utils" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_core" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_data_structures" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_events" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_graphics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_gui_basics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_gui_extra" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_dsp" path="../../JUCE/modules"/>
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</MODULEPATHS>
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</XCODE_IPHONE>
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<XCODE_MAC targetFolder="Builds/MacOSX">
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<CONFIGURATIONS>
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<CONFIGURATION isDebug="1" name="Debug" targetName="Delay" recommendedWarnings="LLVM"
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enablePluginBinaryCopyStep="1"/>
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<CONFIGURATION isDebug="0" name="Release" targetName="Delay"/>
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</CONFIGURATIONS>
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<MODULEPATHS>
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<MODULEPATH id="juce_audio_basics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_devices" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_formats" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_plugin_client" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_processors" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_audio_utils" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_core" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_data_structures" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_events" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_graphics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_gui_basics" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_gui_extra" path="../../JUCE/modules"/>
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<MODULEPATH id="juce_dsp" path="../../JUCE/modules"/>
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</MODULEPATHS>
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</XCODE_MAC>
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</EXPORTFORMATS>
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</JUCERPROJECT>

‎Chapter Code/Chapter 10/Source/Parameters.cpp

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#include "Parameters.h"
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template<typename T>
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static void castParameter(juce::AudioProcessorValueTreeState& apvts,
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const juce::ParameterID& id, T& destination)
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{
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destination = dynamic_cast<T>(apvts.getParameter(id.getParamID()));
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jassert(destination); // parameter does not exist or wrong type
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}
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static juce::String stringFromMilliseconds(float value, int)
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{
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if (value < 10.0f) {
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return juce::String(value, 2) + " ms";
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} else if (value < 100.0f) {
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return juce::String(value, 1) + " ms";
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} else if (value < 1000.0f) {
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return juce::String(int(value)) + " ms";
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} else {
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return juce::String(value * 0.001f, 2) + " s";
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}
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}
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static float millisecondsFromString(const juce::String& text)
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{
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float value = text.getFloatValue();
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if (!text.endsWithIgnoreCase("ms")) {
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if (text.endsWithIgnoreCase("s") || value < Parameters::minDelayTime) {
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return value * 1000.0f;
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}
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}
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return value;
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}
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static juce::String stringFromDecibels(float value, int)
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{
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return juce::String(value, 1) + " dB";
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}
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static juce::String stringFromPercent(float value, int)
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{
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return juce::String(int(value)) + " %";
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}
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Parameters::Parameters(juce::AudioProcessorValueTreeState& apvts)
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{
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castParameter(apvts, gainParamID, gainParam);
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castParameter(apvts, delayTimeParamID, delayTimeParam);
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castParameter(apvts, mixParamID, mixParam);
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}
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juce::AudioProcessorValueTreeState::ParameterLayout Parameters::createParameterLayout()
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{
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juce::AudioProcessorValueTreeState::ParameterLayout layout;
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layout.add(std::make_unique<juce::AudioParameterFloat>(
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gainParamID,
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"Output Gain",
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juce::NormalisableRange<float> { -12.0f, 12.0f },
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0.0f,
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juce::AudioParameterFloatAttributes().withStringFromValueFunction(stringFromDecibels)
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));
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layout.add(std::make_unique<juce::AudioParameterFloat>(
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delayTimeParamID,
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"Delay Time",
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juce::NormalisableRange<float> { minDelayTime, maxDelayTime, 0.001f, 0.25f },
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100.0f,
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juce::AudioParameterFloatAttributes()
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.withStringFromValueFunction(stringFromMilliseconds)
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.withValueFromStringFunction(millisecondsFromString)
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));
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layout.add(std::make_unique<juce::AudioParameterFloat>(
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mixParamID,
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"Mix",
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juce::NormalisableRange<float>(0.0f, 100.0f, 1.0f),
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100.0f,
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juce::AudioParameterFloatAttributes().withStringFromValueFunction(stringFromPercent)
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));
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return layout;
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}
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void Parameters::prepareToPlay(double sampleRate) noexcept
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{
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double duration = 0.02;
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gainSmoother.reset(sampleRate, duration);
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coeff = 1.0f - std::exp(-1.0f / (0.2f * float(sampleRate)));
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mixSmoother.reset(sampleRate, duration);
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}
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void Parameters::reset() noexcept
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{
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gain = 0.0f;
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gainSmoother.setCurrentAndTargetValue(juce::Decibels::decibelsToGain(gainParam->get()));
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delayTime = 0.0f;
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mix = 1.0f;
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mixSmoother.setCurrentAndTargetValue(mixParam->get() * 0.01f);
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}
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void Parameters::update() noexcept
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{
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gainSmoother.setTargetValue(juce::Decibels::decibelsToGain(gainParam->get()));
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targetDelayTime = delayTimeParam->get();
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if (delayTime == 0.0f) {
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delayTime = targetDelayTime;
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}
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mixSmoother.setTargetValue(mixParam->get() * 0.01f);
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}
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void Parameters::smoothen() noexcept
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{
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gain = gainSmoother.getNextValue();
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delayTime += (targetDelayTime - delayTime) * coeff;
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mix = mixSmoother.getNextValue();
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}

‎Chapter Code/Chapter 10/Source/Parameters.h

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#pragma once
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#include <JuceHeader.h>
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const juce::ParameterID gainParamID { "gain", 1 };
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const juce::ParameterID delayTimeParamID { "delayTime", 1 };
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const juce::ParameterID mixParamID { "mix", 1 };
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class Parameters
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{
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public:
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Parameters(juce::AudioProcessorValueTreeState& apvts);
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static juce::AudioProcessorValueTreeState::ParameterLayout createParameterLayout();
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void prepareToPlay(double sampleRate) noexcept;
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void reset() noexcept;
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void update() noexcept;
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void smoothen() noexcept;
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float gain = 0.0f;
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float delayTime = 0.0f;
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float mix = 1.0f;
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static constexpr float minDelayTime = 5.0f;
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static constexpr float maxDelayTime = 5000.0f;
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private:
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juce::AudioParameterFloat* gainParam;
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juce::LinearSmoothedValue<float> gainSmoother;
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juce::AudioParameterFloat* delayTimeParam;
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float targetDelayTime = 0.0f;
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float coeff = 0.0f; // one-pole smoothing
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juce::AudioParameterFloat* mixParam;
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juce::LinearSmoothedValue<float> mixSmoother;
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};

‎Chapter Code/Chapter 10/Source/PluginEditor.cpp

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/*
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==============================================================================
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This file contains the basic framework code for a JUCE plugin editor.
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==============================================================================
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*/
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#include "PluginProcessor.h"
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#include "PluginEditor.h"
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//==============================================================================
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DelayAudioProcessorEditor::DelayAudioProcessorEditor (DelayAudioProcessor& p)
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: AudioProcessorEditor (&p), audioProcessor (p)
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{
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delayGroup.setText("Delay");
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delayGroup.setTextLabelPosition(juce::Justification::horizontallyCentred);
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delayGroup.addAndMakeVisible(delayTimeKnob);
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addAndMakeVisible(delayGroup);
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feedbackGroup.setText("Feedback");
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feedbackGroup.setTextLabelPosition(juce::Justification::horizontallyCentred);
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addAndMakeVisible(feedbackGroup);
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outputGroup.setText("Output");
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outputGroup.setTextLabelPosition(juce::Justification::horizontallyCentred);
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outputGroup.addAndMakeVisible(gainKnob);
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outputGroup.addAndMakeVisible(mixKnob);
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addAndMakeVisible(outputGroup);
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setSize(500, 330);
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}
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DelayAudioProcessorEditor::~DelayAudioProcessorEditor()
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{
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}
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//==============================================================================
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void DelayAudioProcessorEditor::paint (juce::Graphics& g)
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{
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g.fillAll(juce::Colours::darkgrey);
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}
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void DelayAudioProcessorEditor::resized()
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{
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auto bounds = getLocalBounds();
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int y = 10;
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int height = bounds.getHeight() - 20;
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// Position the groups
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delayGroup.setBounds(10, y, 110, height);
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outputGroup.setBounds(bounds.getWidth() - 160, y, 150, height);
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feedbackGroup.setBounds(delayGroup.getRight() + 10, y,
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outputGroup.getX() - delayGroup.getRight() - 20,
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height);
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// Position the knobs inside the groups
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delayTimeKnob.setTopLeftPosition(20, 20);
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mixKnob.setTopLeftPosition(20, 20);
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gainKnob.setTopLeftPosition(mixKnob.getX(), mixKnob.getBottom() + 10);
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}

‎Chapter Code/Chapter 10/Source/PluginEditor.h

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/*
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==============================================================================
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This file contains the basic framework code for a JUCE plugin editor.
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==============================================================================
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*/
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#pragma once
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#include <JuceHeader.h>
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#include "PluginProcessor.h"
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#include "Parameters.h"
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#include "RotaryKnob.h"
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//==============================================================================
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/**
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*/
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class DelayAudioProcessorEditor : public juce::AudioProcessorEditor
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{
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public:
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DelayAudioProcessorEditor (DelayAudioProcessor&);
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~DelayAudioProcessorEditor() override;
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//==============================================================================
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void paint (juce::Graphics&) override;
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void resized() override;
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private:
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// This reference is provided as a quick way for your editor to
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// access the processor object that created it.
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DelayAudioProcessor& audioProcessor;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (DelayAudioProcessorEditor)
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RotaryKnob gainKnob { "Gain", audioProcessor.apvts, gainParamID };
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RotaryKnob mixKnob { "Mix", audioProcessor.apvts, mixParamID };
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RotaryKnob delayTimeKnob { "Time", audioProcessor.apvts, delayTimeParamID };
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juce::GroupComponent delayGroup, feedbackGroup, outputGroup;
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};

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