Windows 10 has mobile voices which can formally be accessed only from windows store apps. However, it is possible to copy the registry keys for these new voices from "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech_OneCore\Voices\Tokens" to "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens". You have to do this in c:\windows\syswow64\regedit.exe in order for NVDA not to throw a com error upon selection.
Of course, this is the ugly way. However, it might be possible to create a new synth driver which gets the voice tokens from the particular registry location.
Windows 10 has mobile voices which can formally be accessed only from windows store apps. However, it is possible to copy the registry keys for these new voices from "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech_OneCore\Voices\Tokens" to "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens". You have to do this in c:\windows\syswow64\regedit.exe in order for NVDA not to throw a com error upon selection.
Of course, this is the ugly way. However, it might be possible to create a new synth driver which gets the voice tokens from the particular registry location.