ElevenLabs is the strongest fit here because it offers a large library of AI voice actors with varied tones, accents, and styles that you can audition and apply directly to your course scripts, and its affordable entry point makes it practical for ongoing module production. You can clone a preferred voice or browse the voice marketplace to find one that matches your course's tone. Descript is worth considering if you also need to edit audio and video in the same workflow, as its voice tools are tightly integrated with a full media editor. For scripting your module narration before recording, Claude Sonnet can help draft and refine the text you hand off to your chosen voice.