Show HN: Use your OpenAI subscription to create audiobooks

PDF TO MP3 allows users to convert PDFs into audiobooks using their existing OpenAI subscription. The process involves connecting an AI, adding a speech key for speech generation, and then sending a PDF in an AI chat with the command "Use the PDF TO MP3 MCP to turn this into an audiobook." Document processing is covered by the user's subscription, while speech generation is billed by Google or OpenAI via an API key.