A free program for iPhone, by Giant Brains LLC.

Audio Editor: Recording Studio is a powerful audio editing app that lets you edit and record your own voice and music in various ways. It offers you a simple and easy way to create and edit songs, albums, and audios in a matter of minutes. With it, you can record your voice or any other sound and add different music effects to it, create a new song by recording your voice and music together, and edit the audio in a number of different ways. It offers you the option to record your music in different formats, edit it, add different music effects to it, and save it in a number of different formats.