Weapon X # 16 Born in England, Jonothon Starsmore was almost normal before his powers manifested. However, the onset of his powers destroyed this life, along with his chest and lower face. This event also paralysed his girlfriend of the time, Gayle Edgerton. As Jono used his powers he destroyed more and more of his body, until it reached the state that it is in today, and he took to covering up the affected areas of his body with wraps of various types.

Jono was not one of the next generation of mutants kidnapped by the Phalanx, despite being on Professor Xavier's list. At 18, he was the oldest of the teenage mutants to be invited to the Xavier School for Gifted Youngsters. Upon joining Generation X he was given the codename Chamber. Still blaming himself for past events, Jono kept to himself and the others found it difficult to relate to him. Early in his career with Generation X, however, he reached out to Penance and helped to convince her to join the team. Despite his low self-esteem and his self-imposed isolation from the others, Jono forged relationships with several of the other students, including Paige Guthrie (Husk) and Angelo Espinoza (Skin).

Most noteworthy of these relationships was his on-off relationship with Paige. When Paige was going through some problems related to the legacy virus, Gateway compelled Jono to talk to her. The talk resulted in their Generation X # 5first 'kiss' which in turn led to the destruction of the Girl's Dorm. Jono took full responsibility for this event, but managed to isolate Paige with his wording. For some time Jono and Paige sent each other mixed-messages and had several misunderstandings. Things were finally resolved just before Paige left Generation X for a few weeks to be with her sick mother. Although Jono had promised to wait for her and it looked like they would date upon her return, Jono was plagued by self-doubt, yet again. When Paige returned he pushed her away. She eventually began dating someone else, something which Jono made no move to stop. His feelings for her, however, remained.

His time with Generation X helped Jono to develop his powers, although he still seems afraid of them and Everett Thomas (Synch) seemed better able to manage them. During this period of his life, Jono went up against mutants such as Emplate and Omega Red, and successfully battled them. He also discovered that his former girlfriend Gayle, had not truly been crippled. When the school opened it's doors to humans, students were told that Jono had lost his voice in an accident as an explanation for the bandages he wore from chest to nose.

Uncanny X-Men X # 395 Just before Generation X disbanded, Jono was offered a place on the X-Men team. Unlike Paige, Jono's goal had never been to join the adult version of Generation X and he seemed unsure of what to do. Returning to England, he found himself in a relationship with Candy Southern, a music star. The relationship drew plenty of attention to the young mutant, especially as Jono had stopped hiding the missing parts of his body and was constantly surrounded by roiling psionic energy. Candy ended things when the press coverage became too negative, and Jono left England to join the X-Men.

His first active mission with the saw Jono enrolling at Empire State University in an attempt to uncover an anti-mutant group. Although Sean Cassidy (Banshee) later attempted to draft Jono into X-Corps, Jono refused to join and went on to help reveal the inner workings of the group. Following this, Jono asked to be taken off active duty with the X-Men with the stated intention of teaching. When he returned to the Xavier Institute, he was shocked by the budding relationship between Paige and Warren Worthington III (Angel). Motivated somewhat by jealousy, he volunteered for another undercover mission - infiltrating the notorious Weapon X. During this time, the damage done to his body by the manifestation of his powers was repaired and, to prove his loyalty, Jono was required to assassinate John Sublime.

Jono went missing whilst working to bring down Weapon X and did not resurface until M-Day when the loss of his powers left him missing parts of his face and chest. It seemed that he had been condemned to existing on life support until he once more disappeared, this time from his hospital bed.

New Excalibur # 9 Taken to England by Clan Akkaba, Jono was given an infusion of Apocalypse's blood which healed his injuries but also drastically changed his appearance, although its impact on his powers is unclear. Although it turned out that Jono was a descendant of Apocalypse, he chose not to remain with Clan Akkaba, also turning down membership of Excalibur.

Relocated to New York, a deeply conflicted and unhappy Jono eventually joined the New Warriors at the invitation of his former teammate Jubilation Lee (Jubilee/Wondra), taking on the new alias 'Decibel'. To replace his lost powers, Jono chose to use a device which created solidified sound constructs. When the team disbanded he left with Jubilee.