Two before after examples of random frequency modulation (reverbed). Reference ... http://www.freesound.org/forum/viewtopic.php?p=24852#24852
A girl breathing heavily.
The distinctive sound of a DB-601 powered Bf-109E-3 Emil flying by at a local aviation event.
A recording of a quiet area with a plane close to ground. Loud hum of engines. consistent
Some rain recorded with an Olympus LS-10.
A large underground car parkade with a few vehicles coming and going. Mainly good steady tone though. Recorded on my ...
AC unit running during the winter.
General noise around apartment building on a summer evening. Audible: people talking indoors and on street, traffic hum, televisions hum, ...
turning & tossing in bed (Foley). Multiple versions CAD M179 >ULN-2 http://www.reuven.nl/sounddesign_postproduction
An ambiance from the kitchen.
Lying down, rubbing pillow, sitting up quickly, then dropping back down
A quick and low "whoosh" or "hit" sound for cinema.
footsteps walking on gravel