You can also adjust the vocal and music effects from the center and main speakers (i.e. left and right speakers). Moreover, DX-213 has a special feature of vocal cancellation. It can eliminate the vocal signal from a regular audio CD for Karaoke singing. Therefore, you can sing Karaoke with any audio CD. The button to control the vocal cancellation in the front panel is very easy to operate. Therefore, DX-213 is the latest technological design for Karaoke amplifier and we are the pioneer in the market to produce such machine.