Starting 1998 hardcore underwent many changes that caused The Outside Agency to no longer feel at home in the genre and they moved their focus to their drum & bass careers as DJ Hidden and Eye-D.[7] Some years later the two released the slower tempo material they'd been producing in the meantime on Black Monolith Records and Otaku Records.

These were noticed by Patrick van Kerckhoven, who offered the two a chance to run their own label under his Cardiac Music umbrella company in 2003.

[9][10][11] The Outside Agency's musical style is not easily characterized, as they produce a wide variety of hardcore that draws influences from several other genres.

This is evidenced by their 2012 album The Dogs Are Listening on the German Ad Noiseam label, which only features two tracks that could be described as crossbreed and sees the duo touching on all styles and tempos they have produced in the past as well as new ones.

[20] They have in the past performed at reputable events such as Thunderdome, Decibel, Defqon.1, Q-Base, Therapy Sessions, Club r_AW and Mystery Land.