One of the more popular deejay app ‘djay’ by Algoriddim is now on sale for a limited time at $0.99, down from $4.99. The version on sale is for iPhone and iPod touch. There is a separate version of ‘djay’ for iPad which is at regular price.
The app provides a virtual turntable interface for music mixing, scratching, beat-matching, EQ control sufficient for your deejay aspiration. It takes advantage of iOS 4 with access to the iPod library and AirPlay function.