The Alesis PlayMate Vocalist is a powerful virtual vocal reducer and microphone processor with a built-in CD player. In addition to reducing vocals from virtually any stereo CD, it can adjust tempo and pitch independently so you can always sing in the optimal key, adjust the tempo to change the feel of the music, and slow down complex passages for easy learning. Includes 100 high-quality reverb algorithms for matching the ambience of the music. Lets you use your entire CD library and never buy another karaoke CD again.