The techno_imp.zip file you have requested: Mods / Sounds / Techno-Imp - 147.97kb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
This file changes sounds for the Imp (see,attack,die) to sounds from Vrenna's folder (melodic heartbeat,feedback, bassline). Considering how many imps are in the game this has a dramatic effect.