The Korg ToneWorks PX4 is a combination multi-effects unit, amp simulator and phrase trainer that offers guitarists a complete practice and personal recording solution. Featuring 58 effects, 25 amp types and 23 cabinet effects in addition to a looping recorder will flexible tempo control, the ToneWorks PX4 allows you to approximate almost any tone and play along with anything you want to learn. Built in rhythm patterns allow you jam on your own as well.