RedOctane developed a new guitar controller for "World Tour". The unit is approximately 25% larger than previous controllers, making it closer to the size of a real guitar. The new controller includes a longer whammy bar and places the Star Power button directly below the strum bar, improving the access of these features. The strum bar itself was made quieter and longer. The neck of the guitar is detachable, similar to the Gibson Les Paul controller for "Guitar Hero III", but the connector has been hardened to avoid connection issues experienced with the previous unit. The neck of the guitar features a touch-sensitive pad just toward the body end from the normal five fret buttons. The player can use either the fret buttons or the touch pad to play regular notes. The pad also allows the player to play notes via tapping or via "tap strumming" similar to the slap bass method for bass guitar, and to alter the pitch of sustained notes. Guitar tracks feature notes connected by a semi-transparent purple line, (except for the Wii and PlayStation 2 version, in which semi-transparent gems replace this purple line) called "Slider Gems"; the player can play these notes by sliding their fingers up and down the touch pad or by tapping the fret buttons without strumming. The touchpad can also be used for sustained and staccato notes in the music studio feature while recording guitar, and is used for finer control over loops when recording other instruments.