Question: I need a tool that can convert large documents into audio files with natural-sounding voices, can you help?

If you need a tool to convert word documents into natural-sounding audio files, NaturalReader is a top contender. This full-featured text-to-speech software can handle a variety of file formats, including PDF and Word, and has advanced AI technology for natural-sounding voices in more than 50 languages. It also has features like voice cloning, content awareness and an OCR camera scanner for turning paper documents into text. NaturalReader offers several subscription tiers for personal, business and education use.

Another option is PlayHT, which has a library of more than 600 ultra-realistic AI voices and supports multiple languages and accents. It also has features like custom pronunciations, voice inflections and real-time voice cloning. PlayHT is good for video voiceovers, audio publishing and e-learning, so it's good for a lot of different uses.

Narration Box is another option, particularly if you need high-quality, natural-sounding voiceovers in more than 140 languages and accents. It's got an intuitive interface, a library of 700+ AI narrators, and advanced features like context awareness and emotive styles. The service offers flexible pricing tiers and custom enterprise deals for heavy users.

Last is Verbatik, a text-to-speech and voice cloning service with more than 600 realistic voices in 142 languages. It can convert files instantly and let you customize voices, which makes it good for marketing, education and multimedia presentations. Verbatik also offers tools like Script Writer AI and Sound Studio, and its service is available through an API for integration with other software.