There's adsorption EVERYWHERE! Those are all slot resonators and other areas that are fully-absoprtive (material covered rockwool).... John (Sayers) designed it fully!
And it sounds freaking AMAZING!!! I have so much sound flexibility... the dark room is very dry with very little ambience... the bright room (larger tracking room) is woody and bright-sounding with a nice room ambience... and the vocal booth has a soundprint somewhere in-between the other two!
And by happy accident, I found I can use the long (26 ft) corridor/interlock as a reverb chamber!
Very, very cool... John did a GREAT job......!!!