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How long would you happily listen to this voice? Play it, then tap the face with that many hours. Your score is saved right away.
1 is worse than bad (you would stop within a minute), 8 is about 4 hours, 10 is perfect (10 hours or more, you would binge a whole series).
Ask yourself: would I happily listen to a whole audiobook in this voice? A voice that anyone scores 3 or lower (under 15 minutes) is hidden for everyone else, so nobody wastes time on it. Other people's scores stay hidden until you open the ranking.