One of the sounds in my first soundpack for xonotic (http://xonotic. Org). Synthesized with zynaddsubfx inside lmms, edited in audacity. Long live linux!.
Closing a metal door in a natural reverberated acoustic. France, 2005. Recorded with octava mc12 in, ortf setuprecorded on fostex fr2wave stereo 16 bits 48khz.