the copy of the phrase which it is quick and is hard to catch by the VSA (Variable Speed Audition) function to change tempo without changing a pitch -- easily . By the key control function in which the key (pitch) of music is freely changeable, practice, by its favorite key is possible. Fine tuning in a 1-cent unit is also possible by a fine Cheung function. The vocal cancellation function which can cancel the sound of the vocal in music. Vocal effector built-in. Since it is a system which cancels the sound of the specific normal position (position on either side) in music, not only vocal but musical instrument sound is cancellable by setup of PART.