Which disorder involves difficulties in producing sounds of appropriate quality, pitch, and/or loudness?

The disorder that involves difficulties in producing sounds of appropriate quality, pitch, and/or loudness is voice disorders. These disorders manifest when there are issues affecting the vocal cords or the structures responsible for voice production, leading to problems such as hoarseness, breathiness, or strain. Individuals with voice disorders may struggle to modulate their voice in terms of pitch or loudness, which can affect their ability to communicate effectively in various situations.

In contrast, articulation disorders focus primarily on the physical production of individual speech sounds. These issues are more about how sounds are formed and may involve substitution or distortion rather than the quality of the voice itself. Fluency disorders, such as stuttering, pertain to the flow of speech and how smoothly one can speak, while substitution disorders typically denote replacing one sound for another, which relates more to articulation rather than the overall quality or characteristics of the voice.