After following the answer for How do I access MacOS Sonoma Personal Voice from command line?, when I run say -v \?, my Personal Voice Lilypad shows up as es_MX:
➜ ~ say -v \? | grep Lilypad
Lilypad es_MX # Este es Lilypad.
Confusingly, say -v Lilypad 12:12 or with an English phrase as the argument, it uses my PV in English when the screen is unlocked, but if I prepend sleep 5; in Spanish when the screen is locked. Is there a way to force it to use English?
In System settings, it's noted that "This Personal voice is available in English (United States), Spanish (Mexico), and Mandarin (China Mainland)."