DeVox!

DeVox - Audio Player and Recorder with FXDeVox allows you to mix and record your microphone input with the songs on your iPhone or iPad. It has high quality digital reverb, compression and noise gate effects for the mic, a vocal canceller to reduce the level of a songs main vocal, and pitch shifter to change song pitch without affecting tempo. System Requirements:iPhone 4/iPad 2 or betterUse with Headphones recommendedOS v7.0 or later