Which aspect of performance is influenced by the actor’s ability to modulate their voice?

The actor's ability to modulate their voice directly impacts intonation, which refers to the variation in pitch while speaking. Intonation shapes the delivery of lines by adding emphasis, expressiveness, and subtlety to a performance. Through effective modulation, actors can convey different emotions, highlight important lines, and clarify meaning, making the character's intentions clearer to the audience.

While projection, emotion, and articulation are also important to performance, they do not directly address the specific modulation of pitch and rhythm inherent in intonation. Projection relates more to the volume and carrying power of the voice; emotion encompasses the overall affective quality conveyed through voice and physicality; and articulation focuses on the clarity of the spoken words. Thus, intonation is the primary aspect influenced by how an actor modulates their voice.