What drum feature did Guitar Hero: Metallica's Expert+ difficulty support?

Guitar Hero: Metallica’s Expert+ drum difficulty supported a second bass drum pedal. The feature was designed to reproduce the demanding double-bass patterns associated with Metallica drummer Lars Ulrich.

The game otherwise uses the drum-controller approach introduced by Guitar Hero World Tour, with colored pads and a kick pedal mapped to on-screen notes. Expert+ extends that setup by allowing two kick pedals, making rapid alternating bass-drum passages playable in a more authentic way.

Because ordinary drum controllers supplied only one pedal, the game supported a splitter and an additional pedal. Some retailers also offered a second pedal as a preorder incentive. Expert+ results were not tracked through the game’s online modes.

The feature is sometimes confused with a general instrument upgrade, but it applied specifically to drums. The other options—voice pitch wheel, touch-screen cymbals, and double-neck guitar—were not the defining Expert+ feature in this game.