Interesting, I had not read of passgates and their associated logic before, thank you. By "disable 8 [of 10] passgates", do you mean driving the control input

Interesting, I had not read of passgates and their associated logic before, thank you. By "disable 8 [of 10] passgates", do you mean driving the control input negative, so that both outputs do not conduct? Also, if you might indulge my edited-in fourth question, 'twould be appreciated. Edit: And then the author of an excellent answer deletes himself, how unfortunate.