Makes it a preference

code/modules/mob/living/say.dm

@@ -364,7 +364,7 @@ proc/get_radio_key_from_channel(var/channel)
 
 			if(M && src) //If we still exist, when the spawn processes
 				//VOREStation Add - Ghosts don't hear whispers
-				if(whispering && isobserver(M) && !M.client?.holder)
+				if(whispering && !is_preference_enabled(/datum/client_preference/whisubtle_vis) && isobserver(M) && !M.client?.holder)
 					M.show_message("<span class='game say'><span class='name'>[src.name]</span> [w_not_heard].</span>", 2)
 					return
 				//VOREStation Add End

code/modules/mob/say_vr.dm

@@ -51,7 +51,7 @@
 
 		for(var/vismob in vis_mobs)
 			var/mob/M = vismob
-			if(isobserver(M) && !M.client?.holder)
+			if(isobserver(M) && !is_preference_enabled(/datum/client_preference/whisubtle_vis) && !M.client?.holder)
 				spawn(0)
 					M.show_message(undisplayed_message, 2)
 			else