ALS (amyotrophic lateral sclerosis) is a degenerative neuromuscular disease; people with late-stage ALS typically retain cognitive function, but lose the motor ability to speak, relying on gaze-controlled AAC (augmentative and alternative communication) devices for interpersonal interactions. State-of-the-art AAC technologies used by people with ALS do not facilitate natural communication; gaze-based AAC communication is extremely slow, and the resulting synthesized speech is flat and robotic. Our project on AAC aims to to enhance both the emotional expressiveness and the throughput (speed) of communications mediated by AAC technologies.