I am working on iphone app, I required multiple voices , e.g. Adult voice become children voice.
How can i implement it, I am using AVFoundation for playing voice.
Plz provide some coded.
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To implement what you need, you need pitch shifting capabilities. You can use OpenAL to achieve this.
Specifically, in OpenAL, to set pitch you do
where source is the id of the OpenAL sound source.
If you are new to OpenAL, get started here: http://benbritten.com/2008/11/06/openal-sound-on-the-iphone/