He owns and runs Conclave & Earshot Studio in Bergen together with former-Enslaved band member Herbrand Larsen.

[3] He joined his first band, the extreme metal act Malignant Eternal, in the mid 1990s and appeared on their album Alarm in 1999.

[6][7] In 2006, Isdal participated in the black metal supergroup I along with Abbath of Immortal, King from Gorgoroth, and former-Immortal drummer Armagedda.

[9] With members of Enslaved and the noise rock group Fe-Mail, Isdal formed the side project Trinacria and released the album Travel Now Journey Infinitely in 2008.

[12][13] In the early 2010s, Isdal recorded an unreleased album with the supergroup Temple Of The Black Moon featuring Cradle of Filth vocalist Dani Filth, guitarist Rob Caggiano of Anthrax and Volbeat, bassist King ov Hell, keyboardist Gerlioz from Dimmu Borgir and drummer John Tempesta of The Cult and White Zombie.