Question: In what year did Tim Gaines leave the band whose eleventh release was "The Roxx Regime Demos"?

Context paragraphs:
SinDizzy: Sin Dizzy was a Christian metal band co-founded by former Stryper members Oz Fox and Tim Gaines.  The band was founded in the mid-1990s after Stryper had disbanded.  Its members included young drummer and lead guitarist .  Bass player Gaines described their sound as "a cross between [the] Stone Temple Pilots and Nirvana".

The Yellow and Black Attack Is Back!: The Yellow and Black Attack Is Back!  is a Stryper tribute album by Christian rock band Guardian.  The album is a re-make of Stryper's debut EP "The Yellow and Black Attack" from 1984.  This record was released in 1999.  The cover-artwork is also based on Stryper's version, with the four missiles on it, featuring the initials of each band's member as it is shown on the original cover: "MS" stands for Michael Sweet, "RS" for Robert Sweet, "OF" for Oz Fox, and "TG" for Tim Gaines; here the initials are: "JR" for Jamie Rowe, "TP" for Tony Palacios, "KN" for Karl Ney, and "DB" for David Bach.

Girder Records: Girder Records is a Christian Metal label started by Greg Hays of GirderMusic.com.  Girder Records has re-issued classic releases such as the re-recording of the Whitecross "Self-Titled" album, now called Nineteen Eighty Seven.  That release was followed by the first ever re-issue of Strkyen "First Strike" on CD.  In 2008 Girder Records release Sin Dizzy "He's Not Dead" which was started by Oz Fox and Tim Gaines or 80's platinum selling artist Stryper.

Robert Sweet (musician): Robert Lee Sweet (born March 21, 1960 in Lynwood, California) is the drummer of the Christian metal band Stryper.  He and his brother Michael founded the band as Roxx or Roxx Regime.  Robert became known as the "Visual Time Keeper" for his wild drumming and captivating drum kits.  Unlike most drummers, Sweet faces in the direction of stage left or right while playing, not straight ahead, so that the audience can see him and not have their view of him obscured by his drumkit.  Sweet also played a key role in the visual direction of the band itself as well as being a significant contributor to the group.

Street Survivors: Street Survivors is the fifth studio album by Southern rock band, Lynyrd Skynyrd, released on October 17, 1977.  The LP is the last Skynyrd album recorded by original members Ronnie Van Zant and Allen Collins, and is the sole Skynyrd studio recording by guitarist Steve Gaines.  Three days after the album's release, the band's chartered airplane crashed en route to Baton Rouge, Louisiana, killing the pilot, co-pilot, the group's assistant road-manager and three band members (Van Zant, Gaines, and Gaines' older sister, backup singer Cassie Gaines), and severely injuring most who survived the crash.  The album performed well on the charts, peaking at #5 (their first top 5 album), as did the singles "What's Your Name" and "That Smell", the former a top 20 hit on the singles chart.

King James (band): King James is a metal/rock supergroup formed in 1993 by guitarist Rex Carroll (formerly of Whitecross).  He joined former Sacred Fire frontman, Jimi Bennett to form the band.  Some time later, they recruited Tim Gaines and Robert Sweet, of Stryper, and released their first album in 1994.  The band supported the album with a tour without Gaines, who declined to join after the recording.  Sweet toured with the band into 1996, but did not participate in their second release.  Carroll and Bennett remained together and released a second album, "The Fall", in 1997.

Modern Warfare (band): Modern Warfare was an early-1980s punk rock band from Long Beach, California.  It featured Jim Bemis (guitar and lead vocals), Tim Gaines (bass), Steve Sinclair (bass), Ron Goudie (lead guitar), Randy Scott (drums), and Tish Lucca (Keyboards).

The Roxx Regime Demos: The Roxx Regime Demos is the eleventh release and third compilation album by Stryper consisting of songs originally released under the band's previous name, Roxx Regime, except for the track "Honestly", which is taken from a later demo.  While the album's general release was on July 10, 2007, pre-sale purchases at Stryper.com shipped on July 7, 2007, a reference to 777, a holy number in Christianity and one that used to appear onstage at Stryper concerts.

Stormer (band): Stormer was an American Hard Rock band that was popular in the 1970s and 80s whose members were Tim Gaines, Donny Simmons, Tom Hardy, Steve Hall, Stephen Shawn, Jeremy Masana, Jimmy Bates and Randy Jones.

Stryper: Stryper is an American Christian metal band from Orange County, California.  The group's lineup consists of Michael Sweet (lead vocals, guitar), Oz Fox (guitar), Tim Gaines (bass guitar), and Robert Sweet (drums).  In 2004, Gaines left the band and was replaced by Tracy Ferrie (bass guitar) but rejoined in 2009, only to be fired after tension between the band, Gaines and his new wife.

Supporting paragraphs: The Roxx Regime Demos Stryper
Answer: 2004