Totally not getting the reason for those extra strings! He didn't use them so, to me, they would just make using the high six that he did use that much more difficult...
Except they were built way before the Egyptians (who put hieroglyphs on everything and there are none in the pyramids - plus there are a LOT buried in the Sahara and so many more across the globe...).
Naturally that just means that Keef pre-dates the Egyptians, ya?