One of my mates that stalks is a long haul airline pilot & he has spent alot of time in the States down-south in recent years.
When he was under my direct supervision he asked me if I had ever herd of a "sound shot" & to which I replied no.
He then went on to explain that whilst in Texas he had been told that taking a "close sound shot" was in fact to shoot into bushes upon hearing a sound that was "probable quarry species that was not visable"
I said-lets just not be doing that over here or there could be a few less dog walkers going home each night!
I did at the time think he was taking the pee-however he has since assured me that he was not!
Either way I think the old sound shot can stay that side of the big pond