A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Dear meadoman2000,
Greetings! Thank you for posting in Microsoft forum.
May I know if you are referring to Text-to-speech (TTS) feature in PowerPoint? Speak is a built-in feature of Word, Outlook, PowerPoint, and OneNote. You can use Speak to have text read aloud in the language of your version of Office. For reference ,see Use the Speak text-to-speech feature to read text aloud - Microsoft Support
I tested and checked, the Speak function does not work directly in slide show mode. When you are in editing mode, select the portion of the text that you want to be read out loud. This will activate the Speak button in the Quick Access Toolbar, while it is reading, you can switch to Presentation mode. To use Speak function, you need to select text or block text to activate it in editing mode. It won’t continue reading the text in slide show mode.
I understand your requirement and I agree it would be a great improvement to PowerPoint if Speak (or any alternate method) can be implemented in slide show mode. In this regard, I will request you please consider sending your feedback toPowerPoint feedback portal and let the Product group know about your requirement. The Feedback portal is the best way to give feedback to Product Group as it’s actively monitored by them.
Thank you for your understanding and co-operation. Stay safe and stay healthy.
With sincerest regards,
Neha Singh | Microsoft Community Moderator