Yamaha 4 Pad Drum Machine 50 Programmed Drum Kits + Custom Kits Large selection of world percussion Voices plus memory space for creating your favorite original set. 4 Pads and Foot Pedal Input 4-pad basic layout and input for foot pedal provide the feeling of real acoustic drums. AUX-Input for Playing Along with your Favorite Music lets drummers plug in an MP3 player or an iPod and play along with their favorite music. Play-along Mode and Music Book 50 songs for practice and play-along. You can erase the drum part completely or partially. With tempo control, Music Book or your MP3 player, you have an effective, easy way to practice