SIN was formed in 2001 by long time friends Charles Daza, Gilchrist Tan and Kiel Flores in Kawit, Cavite after talking about how they really wanted to have a metal band. Shortly after, Macoy Manuel and Paul Rous jumped in to complete the original line up. Eric Perlas of Tower of Doom later on helped them record the demo that was to launch their career; after submitting the demo to Joey Dizon of PULP Magazine, they were featured in the publication and were eventually included in the PULP Summerslam line-up.

While their four-track EP titled Pilgrimage was halfway finished, vocalist Kiel Flores and bassist Paul Rous had to part with the band due to personal reasons, allowing Charles Daza to step in as their new frontman. Soon after finishing the EP, the band's long time friends Rommel Vasquez and Alvin Quiñones joined in 2003 to once again complete the lineup and breathe new life to SIN.

Their biggest break, however, came when SIN competed in the Philippine leg of the World Battle of the Bands (WBOB) in 2006. SIN was chosen as one of the top three finalists along with Faspitch and Queso. As part of the contest, their song Amorphosis was included in WBOB's promotional compilation cd. All three bands toured Luzon, Visayas and Mindanao. SIN bagged second place in the final event held at the SM Mall of Asia. Right after WBOB, SIN signed up with Eric Perlas' home studio-turned independent record label, Tower Of Doom, and was set to release their first full-length album. Prior to that, however, one of SIN's songs titled Pilgrimage was included in the Tower of Doom Compilation CD Volume 1 together with fellow artists from the label.

SIN released the music video for their song Amorphosis in at the start of 2007. SIN also shared the stage with one of the biggest international metal bands, Death Angel, during the Pulp Summerslam held on April 2007. By the end of summer 2007, they hit the road with other Tower of Doom bands during the Siege Tour 2007 with stops at several areas within Luzon for two weeks straight. Live band performances and excerpts from the tour were then compiled and released in the Tower of Doom Siege Tour DVD 2007. In 2008, SIN played bigger shows with more international metal bands like Darkest Hour, Mahatma, and fronted for Shadows Fall at their concert in Manila. SIN was also featured as the cover for Pulp Magazine's May 2008 issue while finishing off their soon to be released album.

July 2008, after years of constant hard work and endless struggles, Audio Summoned Flesh was finally released and is currently available at major record stores nationwide made possible by Tower of Doom's distribution arm, Galaxy Records. The album has 10 tracks of pure in-your-face metal mayhem delivered to the extreme. Also coming up this October to November is the Siege Tour 2008 which will not only cover major areas in Luzon, but will also head to as far as Visayas and Mindanao. You can visit SIN's myspace page, www.myspace.com/sincavite for info, gig skeds and updates.