Talked to Apple on the phone today for over an hour and shared my screen. Was not able to solve this issue and the agent has the same issue on the Mac she worked on. Apparently it is a bug known to Apple and she said that she sees a big focus on accessibility updates and expects it to be solved rather sooner than later. Given that Catalina is about to be replaced this is not really credible – the bug is nearly a year old now – at least.
I have had this issue also on an older iPad Mini 2 or so, still on iOS 13 and in the native Books app and there has not been any improvement here in a long time.
It is absurd that TTS fails in Apple's Books app, where you can not get the keybinds to work and need to use the context menu, which then triggers the old voice. I tried a few key combos, not thoroughly testing though, assuming either alt or shift or cmd might be what causes issues in Books. No luck. Can you try?
In /System/Library/Speech/Voices/ you can delete everything "compact" since those are only the sample files. You can also probably delete everything that does not include Siri in its name since those are lower quality voices.
@SaguaroSeven after killing Fred it uses Victoria. Kill her too and it stays quiet.
You probably want Nora, which is the most natural US female Siri.
Can somebody try to rename the files? This might be a workaround that is faster than waiting for Apple to solve this.
Killing the actual Victoria, making a clone of Nora and renaming her Victoria where relevant. That way allowing "Speak Text" to still use its beloved Victoria while secretly giving it Nora. Should even seamlessly work after the fix.
Why does all this remind me of Westworld?
I found someone on Reddit commanding killall SpeechSynthesisServer in context of a similar issue but it does not even cause a reaction Terminal to me.
https://www.reddit.com/r/MacOS/comments/cy4tg8
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Seriously, if someone could Dr. Frankenstein the s*** out of Victoria and Nora that might be our best try. I have no idea how to approach this and no idea how the plist files etc. function.
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Can someone confirm this bug persists in Big Sur?
I just tried to simply rename a Nora clone folder to Victoria and that is not enough. You really need to start messing around with the files inside.