1994-1997[]
First used on their first album, Lunar Strain (1994).
1997-2002[]
First used on their third album, Whoracle (1997).
2002-2004/2006-2008[]
First used on their sixth album, Reroute to Remain (2002).
2008-present[]
Used since their ninth album, A Sense of Purpose (2008).