Glory to God.
I can listen to Logos Bible audio and other sound files for school on my Surface Pro through external speakers again.
https://www.logos.com/product/34146/esv-hear-the-word-audio-bible
(the new original Surface Pro I bought has a mysteriously non-working headphone jack)
The solution was a SoundBlaster item that plugs into a USB Port. Attach speaker, make them live in Control Panel, and voila sound again through my speakers.
Thank You Jesus.....
(and my stepson, who is usually inspired by The Holy Spirit, who thought of the solution).
p.s. Sorry everyone I do not know the part number....but it does come with a cap that once deattached stays nearby via a string atached to it - after you plug it in. I do not think it was very expensive either.