This type of lever mixer, ،wever, can be tricky and temperamental to operate, with users needing to make many small adjustments before getting the lever into the perfect position on both axes. With a louder and more dominating presence on the wall, meanwhile, systems that rely solely on ،ons and turn dials like Gessi’s Hi-Fi mixer, while not as minimal in form, put the same amount of control at the users’ fingertips, only with a larger and more forgiving interface.