This paper investigates communication, including computer-based speech aids by people with severe cerebral palsy—namely Augmented and Alternative Communication, AAC. The reduced bodily capacities and the “uncontrolled bodies” of CP sufferers make bodily synchronization with their partners a considerable challenge. What is more, the electronic speech aid not only produces a disembodied language (synthetic speech), but also has a massive impact on the mutual corporeal attunement of the participants. It will be shown that these detrimental effects of AAC can lead to a breakdown in temporal, sequential and topical structure, and to interactional failure and lack of understanding. However, there are ways to overcome these risks—for example, a “moderator” who channels and controls co-participants’ activities despite the Augmented/Alternative Communicator’s focus on the machine, even during the production of a complex utterance. Thus the machine can be “embodied,” and the interaction can—despite CP—become an “intercorporeal” one.