In a memo sent to members Thursday, the guild says the Kindle 2's "Read to Me" feature "presents a significant challenge to the publishing industry."

The Kindle can read text in a somewhat stilted electronic voice. But the Authors Guild says the quality figures to "improve rapidly." And the guild worries that could undermine the market for audio books.

It is telling authors and publishers to consider asking Amazon to disable the audio function on e-books it licenses.

Amazon spokesman Drew Herdener said the company has the proper license for the text-to-speech function, which comes from Nuance Communications Inc.

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