If you took a drum, and put 1 vent hole in it, how would it compare to the same exact drum with say, 3 vent holes in it. Or 5. Where is the threshold for of noticeable change in tone? (2% of the shell area for example) OK maybe I'm splitting hairs, but I still want to know what thoughts are floating around out there. I'm trying to figure out how many holes I should put in my future Vaughncraft shells. Thanks.