If you don't mind, could you share a sample? I'm curious to hear if these voices actually sound good or just like the wobly shaky acapela voices as per usual. Unless it's a compact voice, of course.
Suppose it's in german? Just write something about your experience with that voice, if you think it sounds close to the original counterpart or not, etc. Be creative lol. Maybe some info about how the process worked, or what you had to pay for it and stuff, that'd be useful to know more about actually.
Just do a recording of your soundcard, that's the most natural. Obs studio, fp recorder, or virtual recorder come to mind. Mute your mic if you desire and that's it.
Well, I use 2 voices for tts mainly. If its vocalizer Allison, I would say thank you for helping me for many years, and ask what her favorite thing is to read. If its Glados, I am going to run as fast as I can and Hope she can't follow.