 Both a single-pickup version (the U1) and triple-pickup version (the U3), were manufactured and sold alongside the U2.The U1, U2 and U3 were first reissued between 1998 and 2001, with the U3 including new features such as a six-position switch which would allow the player to select bridge, middle, neck, bridge and neck, bridge and middle, middle and neck, or with the "blow" switch, all three pickups at once.In 2005 the 56 Pro was released as a limited edition re-issue of the U2.