With a wealth of high-tech features like slow speed audition that lets you change the speed of playback without changing pitch, a seamless loop function to let you practice difficult passages over and over, multi-effects including vocal pitch shifter to enhance your performance quality, and a cue function, this unit will improve your performances dramatically. Plug 2 mics directly in and listen through headphones or send a mix through the line out to record. Voice cancel function will remove center-panned vocals. Works great for instruments as well. Runs on batteries or optional power supply.