AKAI RIFF-O-MATIC U40 Phrase Sampler Includes AC adapter and instruction manual. No outer box. Used item, so there are scratches and scuffs. AC adapter and instruction manual are included. This phrase sampler allows you to play back recorded music phrases at different tempos (2/3 or 1/2) without changing the original pitch. This is convenient for checking fast phrases and solos, and is also ideal for guitar ear training and practice.