Guitar Hero II are notable in the real world such as the USA and Battle Axe (a similar looking bass is played by Gene Simmons, and the guitar was played by John Christ of Samhain/Danzig fame). Basses, such as the Music Man StingRay, Gibson Thunderbird, and the Höfner bass (as made famous by Paul McCartney, the bassist for the Beatles) are also available for co-op play. The band itself plays with Orange amps and DW drum kits, along with more in-game endorsements. When the player passes each set of songs in career mode, his/her band is rewarded with money and equipment endorsements, including
Bass guitar ferrous metal strings within the magnetic field of the permanent magnets in magnetic pickups produce small variations in the magnetic flux threading the coils of the pickups. This in turn produces small electrical voltages in the coils. Many bass players connect the signal from the bass guitar's pickups to a bass amplifier and loudspeaker using a 1/4" patch cord. These low-level signals are then strengthened by the bass amp's preamplifier electronic circuits, and then amplified with the bass amp's power amplifier and played through one or more speaker(s) in a cabinet. Most basses have a volume potentiometer ("pot" or "knob"),