"World Tour" features a wireless six-piece drum kit, with a bass drum pedal and five velocity-sensitive drum pads, which Activision has stated provide the "most realistic drum experience ever in a video game". Generally, the pads represent the snare drum (red), the tom-tom drum (blue), the floor tom (green), the hi-hat cymbal (yellow), and the crash cymbal (orange), however, they can be used for other percussion instruments depending on the song. The bass drum is represented by a purple, horizontal line on the highway, which players must use the drum pedal to hit. The drum kit was designed with help from John Devacka, the developer of "MTV Drumscape", and developed key patents used for most modern music games that are now owned by Activision. Special note gems on the drum track, representing accent notes, are "armored", requiring the player to strike the corresponding drum head harder in order to break the armor and score more points. During song creation, the velocity sensitivity feature of the drum pad allows players to alter the sounds made by the drums. The drum set also has a MIDI input port in the back, allowing users to connect a compatible MIDI drum kit to play in the game. The Wii version of the drum controller includes a slot for the Wii Remote to fit into, enabling it to become wireless, much like the guitar controller introduced for the Wii version of "Guitar Hero III".