Editing Deus Ex (video game) (section)

===Audio===
The music of ''Deus Ex'' was handled by members of Straylight Productions, a music group who had notably worked on the ''[[Unreal (video game series)|Unreal]]'' series.<ref name="StraylightResume"/> The main composer was [[Alexander Brandon]],<ref name="BrandonInterview"/> with additional work by [[Dan Gardopée]], [[Michiel van den Bos]] and [[Reeves Gabrels]].<ref name="StraylightResume"/><ref name="OSTinfo"/> Gabrels' contributions were the club songs for New York, Paris and Hong Kong.<ref name="Manual"/>{{Rp|21}} Speaking in 2007, Brandon remembered ''Deus Ex'' as his favorite project due to positive feedback from players.<ref name="BrandonInterview"/> As with their earlier projects, the music used the MOD [[module file]] format.<ref name="StraylightNews"/> The main theme was based on an unused music track created by Brandon for a cancelled ''Unreal'' project.<ref name="DEIWgama"/> ''Deus Ex'' was Brandon's last game as a member of Straylight, as he moved to Ion Storm as head of their audio department.<ref name="StraylightNews"/>

Speaking about the voice acting, Brandon described it as "really cheesy" but effective due to it communicating the different characters' personalities quickly.<ref name="DEIWgama"/> Both JC and Paul Denton were voiced by Jay Anthony Franke, an aspiring voice actor who was working in QA at Ion Storm at the time. Franke estimated his lines totaled between 11,000 and 14,000 words. As he was also a QA tester for the game, his lines were added in very late by the sound team so he would not have to listen to himself during testing.<ref name="Franke2012"/> Spector estimated that the game had around 150,000 lines of voiced dialogue, which was localized into European languages for its release on those regions.<ref name="EuroPreview"/>