The band re-entered the studio in January 2006, after touring in support of Siren Song of the Counter Culture, and recorded their fourth studio album at the Blasting Room studio in Fort Collins, Colorado with producers Bill Stevenson and Jason Livermore. "The Sufferer & the Witness" was released on July 4th, 2006 peaking at number 10 on the Billboard 200 and received generally positive reviews from critics and was a commercial success along with their singles "Ready to Fall", "Prayer of the Refugee" and "The Good Left Undone". Rise Against toured in support of The Sufferer & the Witness throughout the second half of 2006 and all of 2007. The band was a headliner in the 2006 Warped Tour as part of The Sufferer & the Witness Tour. In late 2006, the band co-headlined a tour with Thursday that included the bands Circa Survive and Billy Talent. "The Sufferer & the Witness" has less of the hardcore punk feel from the band's previous albums. In 2007, Chasse decided to leave the band and was replaced by longtime friend Zach Blair from Only Crime. During this tour, on July 3, 2007, Rise Against released an EP in Canada titled "This Is Noise", which was subsequently released in the United States on January 15, 2008.