TOKYO (MacHouse) – MacHouse is soon to introduce a 5th Mac application of the month. Available in some 7 hours is called ExtraTunes. ExtraTunes is a simple Mac application that will access iTunes data and add extra features to your iTunes. You can batch-duplicate existing audio and video files by selecting files and then clicking on the Duplicate button. Likewise, click on Convert-AAC to batch-create AAC versions of audio files.