Option Esc and right click start speaking use two different Siri voices
There was a closed thread on this from a few years ago that had no answer to it so I'm reopening it here.
The subject says it all. If I use Option-Esc to have my 2017 Macbook Pro, with 16Gb of memory running MacOS Big Sur 11.6, start speaking it uses the voice I select, if I select only part of the page by highlighting and navigating to "start speaking" it uses the voice "Alex"
I called support at one point and the Apple Advisor had me uncheck and recheck a bunch of things and close and reopen all my programs and eventually it did start to use the Siri voice I had selected. I was happy and assumed there was a secondary cache somewhere that just needed to get updated on my system but it did not take it long for the system to revert back to doing exactly what it did before. On top of that, for the life of me, I cannot remember what the Apple Advisor had me do for the temporary fix.
MacBook Pro 13″, macOS 11.6