Thanks, I found the answer, by some user named Trebor 
here:
https://forum.audacityteam.org/t/what-is-the-best-way-to-get-normal-deep-voice-in-audacity/48752/1
I found reducing pitch by 5 percent was perfect. No unnatural distortion, but adds exactly the kind of deeper voice that makes it particularly pleasant to listen to.
All best - Bill.