trigger_random, the target being a sound (the steam) set min and max time to w/e u like, with flags 1&2 on. (start on, and continually fire)
if you need further info: <a href='http://www.natural-selection.org/Mapping_Guidelines.html#trigger_random' target='_blank'>http://www.natural-selection.org/Mapping_G...#trigger_random</a>
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eAi
if you need further info: <a href='http://www.natural-selection.org/Mapping_Guidelines.html#trigger_random' target='_blank'>http://www.natural-selection.org/Mapping_G...#trigger_random</a>