Reverb effect in iPhone app

Can anyone please give pointers how we can add re verb effect to a recording in an iPhone app?

Vocal live free on app store is a pretty good example of how I would want to include reverb effect.

Core Audio Overview in iOS documentation references reverb as an audio unit.

Any help beyond this will be helpful.

How do I get reverb on my Iphone?

You can get there in iMovie by clicking on the filters tab above the clip preview window. In the tab options there select "Audio Effects" and the Small Room, Medium Room, Large Room and Cathedral presets apply different amounts of reverb.

Is there an app that adds reverb?

VideoVerb: Add Reverb to Video on the App Store.

How do I get echo effects on my Iphone?

To create your echo, simply un-mute the audio in the original video clip. Then grab the extracted audio below and drag it to shift it slightly. The more shift the more pronounced the echo. You can copy and paste the extracted audio if you need to create additional echos.

Yoy can use ObjectAL library. See link below https://github.com/kstenerud/ObjectAL-for-iPhone.