Which type of therapy is aimed at improving resonance, loudness, intonation, and speech rhythm?

Voice therapy is specifically designed to target various characteristics of speech including resonance, loudness, intonation, and speech rhythm. This type of therapy often involves exercises and practices that help individuals modify their vocal quality, strengthen vocal fold function, and enhance their overall expressive abilities. Voice therapy may include techniques such as breath support exercises, vocal warm-ups, and strategies for managing pitch and volume, which are all fundamental components in improving the flexibility and effectiveness of one's voice.

In contrast, auditory training focuses on enhancing listening skills and auditory processing rather than directly influencing voice qualities. Speech sound production training is aimed at correcting specific sound production errors and improving articulation. Communication skills training, while broader in scope, encompasses the development of overall interpersonal communication but does not specifically target the voice characteristics mentioned in the question. Thus, voice therapy stands out as the appropriate option for addressing those particular aspects of speech.