If you actually go to the website of the people who created those audio books you will see that they state
Quote:
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Every audio book produced and recorded by professional actors/narrators and experienced directors. No computerised text-to-voice convertions have been used.to use real people
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And on the
download page they say:
Code:
8 Kbps [FREE] Bearable quality
16 Kbps ($5 USD) Tolerable quality
24 Kbps ($6 USD) Reasonable quality
32 Kbps ($7 USD) Good quality
48 Kbps ($8 USD) Very good quality