Final answer:
Speakers should use descriptive language and balanced dialogue to create effective voice in the audio.
Step-by-step explanation:
The question is asking about the speaker's role in the audio. In order to create effective voice, the speaker should use descriptive language and balanced dialogue. They should show events, actions, and thoughts through narration, while reinforcing the narration with appropriately placed dialogue. Additionally, if the speech incorporates multimedia components, the speaker should plan how to access the audience or platform.