voice with a lot of noise even with clear audio

I tested the free version for 3 voices with clean sounds and none was without noise and complete speeches, even when it is recorded it is bad, I think it needs to put a better voice improvement before trying to sell 50 voices for a price that does not match the quality of sound, that's because you still have to wait more than a day to process an audio that has a 90% chance of not being good..