# Usage

Once the Dual Channel Application is installed and synchronised, it will show you which input and output devices are in use.

{% hint style="warning" %}
Remember to check that your headset is selected in the “Input” category.
{% endhint %}

You can test the input and output of your device.

When the Dual Channel application and Live Application are properly synchronised, this icon ![](https://content.gitbook.com/content/RFCbypPSQCx2ezWjFUPY/blobs/7OjqLScVOcyzCFfWHhsr/image.png) appears in the top right corner of both applications.&#x20;

You no longer need to take any action on this application, which will run in the background when you are logged into Live Application.

{% hint style="danger" %}
The Dual Channel app must remain open for CogNeed to listen to your conversation partner's audio stream! However, it can be minimised or put in the background.
{% endhint %}
