# Applying filter to audio

**URL:** https://react-native-webrtc.discourse.group/t/applying-filter-to-audio/1071
**Category:** General
**Created:** [December 16, 2020, 11:18am UTC](https://react-native-webrtc.discourse.group/t/applying-filter-to-audio/1071 "2020-12-16T11:18:33Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![implicit-invocation](https://yyz2.discourse-cdn.com/free1/user_avatar/react-native-webrtc.discourse.group/implicit-invocation/32/330_2.png) [@implicit-invocation](https://react-native-webrtc.discourse.group/u/implicit-invocation)
#### Post date: [December 16, 2020, 11:18am UTC](https://react-native-webrtc.discourse.group/t/applying-filter-to-audio/1071/1 "2020-12-16T11:18:33Z")

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I want to add voice changing effects to our voice call.  
But I cannot find how to access and/or intercept/replace the audio source in the iOS/android source code.  
Did anyone work with the similar use case before? Please shed some light!