The voice and sound features integrated into some sex dolls aim to add a layer of realism to interactions, but their effectiveness varies widely depending on the technology used. Current advancements have enabled dolls to produce relatively natural-sounding speech, breathing sounds, or ambient noises, which can respond to touch or commands. High-quality sound modules can simulate soft breathing, moaning, or even heartbeat sounds, contributing to a more immersive experience. However, while these features are impressive, they often lack the nuanced emotional expression and spontaneity of real human voice interactions. Many dolls rely on pre-recorded phrases or basic sound patterns, which can sometimes feel robotic or repetitive. Some advanced models incorporate artificial intelligence to generate more dynamic and contextually appropriate responses, increasing realism. Despite technological improvements, voice and sound features are generally supplementary to physical realism and may not perfectly replicate the complexity of human speech and emotion. They are most effective when used to enhance overall experience rather than serve as fully autonomous conversational partners. Overall, while voice and sound features have become more sophisticated, they still have room for improvement before achieving complete naturalness.