Hi guys, I've got a project on at the moment where the main focus is on a group of soldier holed up in Afghan bunker. During many of the scenes, the sound of mortar coming down on them remains constant. The detonation start distant and begin to zero in over the course of the play. Thanks to a great little library from EFX Audio as well as The Whoosh from Tonsturm, I've got the actual mortar shots and detonations sorted.
What I'm trying to achieve now are the the little nuances created by distant tremors in the ground. Things like unsettled dust, creaking fixtures and crumbling plaster. I've managed to replicate some of this by slowly pouring rice onto a plastic lid but I'm looking for a little more variety now that the mortars are persistent throughout the storyline.
Any tricks or techniques to achieve these subtle sounds?