What determines a total multimedia experience?

According to F.T. Marinetti, film is an encompassing art form. John Cage believed that a total artistic experience involves the audience to a large extent. I don't believe that to have an all-encompassing effect on a human mind that every single sense must be triggered and all art forms need be involved. Obviously the more types of media involved, the more a piece of work will effect different aspects of the brain. But more is not always better. I believe that even without technology a great multimedia experience can be obtained, like the old days where they had live music and theater instead of audio tracks and computer graphics. Sometimes just two forms of media can have a much stronger effect on the viewer than all of them. It is through different combinations of mediums that artists will tap into new ideas and evoke different emotions from the audience.