# Usage of AudioProcessorParameterGroup

**URL:** <https://forum.juce.com/t/usage-of-audioprocessorparametergroup/40179>\
**Category:** General JUCE discussion\
**Created:** [June 17, 2020, 3:49pm UTC](https://forum.juce.com/t/usage-of-audioprocessorparametergroup/40179 "2020-06-17T15:49:53Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Maestro](https://avatars.discourse-cdn.com/v4/letter/m/3bc359/32.png) [@Maestro](https://forum.juce.com/u/Maestro)\
**Post date:** [June 17, 2020, 3:49pm UTC](https://forum.juce.com/t/usage-of-audioprocessorparametergroup/40179/1 "2020-06-17T15:49:53Z")

</div>

Hello guys,

I’m trying to use `AudioProcessorParameterGroup` but I don’t succeed. I added the following code to PluginProcessor’s constructor:

```
auto parameterGroup = std::make_unique<AudioProcessorParameterGroup>("GroupID", "GroupName", "|");
parameterGroup->addChild(std::make_unique<AudioParameterFloat>("INPUT", "Input Volume", { 0.0f, 60.0f, 0.0f, 1.0f }, 0.0f, "dB"));

```

Unfortunately this does not work. What am I doing wrong? Can anyone give an example for correct usage of `AudioProcessorParameterGroup`, please?

---

<div class="post-metadata">

**Author:** ![HowardAntares](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/howardantares/32/4629_2.png) [@HowardAntares](https://forum.juce.com/u/HowardAntares)\
**Post date:** [June 17, 2020, 3:52pm UTC](https://forum.juce.com/t/usage-of-audioprocessorparametergroup/40179/2 "2020-06-17T15:52:47Z")

</div>

> [@Dirk](#):
>
> Unfortunately this does not work.

Can you tell us what you mean by “does not work”?

---

<div class="post-metadata">

**Author:** ![Maestro](https://avatars.discourse-cdn.com/v4/letter/m/3bc359/32.png) [@Maestro](https://forum.juce.com/u/Maestro)\
**Post date:** [June 17, 2020, 3:57pm UTC](https://forum.juce.com/t/usage-of-audioprocessorparametergroup/40179/3 "2020-06-17T15:57:38Z")

</div>

The above code is based on here

[https://forum.juce.com/t/plug-in-parameter-groups/29409/7](https://forum.juce.com/t/plug-in-parameter-groups/29409/7)

Obviously the second line is wrong. I added the code to DSPModulePluginDemo. When trying to build I get the following errors in VS 2019:

```
>D:\DSPModulePluginDemo\Source\DSPModulePluginDemo.h(109,39): error C2672: 'std::make_unique': no matching overloaded function found (compiling source file ..\..\Source\Main.cpp)
>D:\DSPModulePluginDemo\Source\DSPModulePluginDemo.h(109,1): error C2784: 'std::unique_ptr<_Ty,std::default_delete<_Ty>> std::make_unique(_Types &&...)': could not deduce template argument for '_Types &&...' from 'initializer list' (compiling source file ..\..\Source\Main.cpp)
>D:\DSPModulePluginDemo\Source\DSPModulePluginDemo.h(109,23): error C2672: 'juce::AudioProcessorParameterGroup::addChild': no matching overloaded function found (compiling source file ..\..\Source\Main.cpp)

```

How can I avoid them?

I already looked at some of the tutorials and the Projucer’s demo projects but I haven’t found an example which explains the usage of AudioProcessorParameterGroup yet.

---

<div class="post-metadata">

**Author:** ![Maestro](https://avatars.discourse-cdn.com/v4/letter/m/3bc359/32.png) [@Maestro](https://forum.juce.com/u/Maestro)\
**Post date:** [June 17, 2020, 7:12pm UTC](https://forum.juce.com/t/usage-of-audioprocessorparametergroup/40179/4 "2020-06-17T19:12:13Z")

</div>

I found the problem producing the errors. The second line must be

```
parameterGroup->addChild(std::make_unique<AudioParameterFloat>("INPUT", "Input Volume", NormalisableRange<float>(0.0f, 60.0f, 0.0f, 1.0f), 0.0f, "dB"));

```

Nevertheless, a tutorial about using AudioProcessorParameterGroup or at least detailed instructions would be very helpful.