# How to use AudioProcessorValueTreeState's SliderAttachment?
**URL:** https://forum.juce.com/t/how-to-use-audioprocessorvaluetreestates-sliderattachment/17720
**Category:** Audio Plugins
**Created:** [May 16, 2016, 6:48am UTC](https://forum.juce.com/t/how-to-use-audioprocessorvaluetreestates-sliderattachment/17720 "2016-05-16T06:48:44Z")
**Posts on this page:** 1
**Showing post:** 5
### Author:  [@mashu](https://forum.juce.com/u/mashu)
#### Post date: [May 16, 2016, 7:41am UTC](https://forum.juce.com/t/how-to-use-audioprocessorvaluetreestates-sliderattachment/17720/5 "2016-05-16T07:41:59Z")
this is my first time trying to use any of the audioProcessorParameter classes, so obviously i’m doing something really wrong here. Here’s what i have so far:
(and sorry, it’s a button i’m trying to connect at the moment, not a slider)
in my PluginProcessor.h, as a public variable:
```
AudioProcessorValueTreeState mainValueTree;
```
and then here are the first lines of my PluginProcessor’s constructor:
```
PluginProcessor::PluginProcessor()
: mainValueTree (*this, nullptr)
{
mainValueTree.state = ValueTree ("mainValueTree");
NormalisableRange buttonRange (0, 1, 1);
mainValueTree.createAndAddParameter ("clockForwards", "ClockForwards", "clock forwards", buttonRange, 0, nullptr, nullptr);
```
and then in my GUIcomponent.h
```
AudioProcessorValueTreeState::ButtonAttachment* clockForwardsButtonAttachment;
```
and then finally, in the constructor of my GUIcomponent.cpp, after the clockForwards button is added, i have:
`clockForwardsButtonAttachment = new AudioProcessorValueTreeState::ButtonAttachment (p.mainValueTree, "clockForwards", *clockForwards);`
this doesn’t work, and gives me a seg fault. Obviously i’m doing it wrong, but quite in the dark here how to do it right.
(btw: clockFowards is just an ordinary text button, created with the projucer)
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