I think no one has dared to make any UDF or support for these voices and it would be good. I was able to investigate a little of it thanks to OleViewDotNet, which is an open source tool to know the objects installed on the system, although the bad thing is that it does not show you the name of the object itself but I suppose it is the name of the application. I tried to create an object (sapi_onecore.spvoice) with autoit and did some sort of check if it was created, so no good results. Another alternative is that these voices can work with sapi.spvoice but adding the tokens with sapi.spObjectTokenCategory and the voice registries (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech_OneCore\Voices). I could do a collaboration if possible.
I think no one has dared to make any UDF or support for these voices and it would be good. I was able to investigate a little of it thanks to OleViewDotNet, which is an open source tool to know the objects installed on the system, although the bad thing is that it does not show you the name of the object itself but I suppose it is the name of the application. I tried to create an object (sapi_onecore.spvoice) with autoit and did some sort of check if it was created, so no good results. Another alternative is that these voices can work with sapi.spvoice but adding the tokens with sapi.spObjectTokenCategory and the voice registries (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech_OneCore\Voices). I could do a collaboration if possible.