AudioExplorer indexes music and sound effects used in apps (including audio contained in mp3, mp4, m4a, wav, caf, aac, adts, aif, aiff, aifc, au, snd, and sd2 file extensions) and stores a cache of the files in the library directory. It provides a menu that operates like a sound boardjust tap on the audio file and it plays.

This app is free on BigBoss repo and I think it's useful if you want a game's soundtrack or dialogue.