Urecord

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Urecord is an uncompressed audio recorder that includes a built-in audio player. It also allows the user to choose a desired recording quality.

Urecord is open-source via the GPL, so feel free to get the sources:

https://bitbucket.org/thomasebell/urecord

INFO: for those that don't know how to exit the audio player; just press the back button on your device.