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I Have .ATM Audio files from Rock band unplugged psp, this format is only used for song audios in the game, other audios such as sound effects uses .bnk or .at3, i would like to know if i can convert this to other format or vice versa

Sample file, what's my age again by blink 182: https://www.mediafire.com/file/sny0wcwj ... N.ATM/file