# 10. Sonar

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This scene demonstrates the use of the **DRMController** delegates, that allow executing custom code when those events are detected.&#x20;

In this case **DRM Live Object** is generated at regular intervals (for sonar effect) and after adding it to the pool, **DRMController** calls **OnObjectAddedToPool** event, allowing custom script to detect it and play audio and render lightning effect.

{% hint style="info" %}
**DRMController** delegates are explained in the [Delegates](https://amazing-assets.gitbook.io/dynamic-radial-masks/scripts-and-run-time-api/drmcontroller/delegates) chapter.
{% endhint %}