Amazon and Audible today announced that they have doubled the number of e-book titles that support WhisperSync for Voice, the feature that lets users switch between reading and listening to a narration of the book.

In addition to increasing the number of Kindle books that support Whispersync for Voice to more than 30,000 titles, Amazon has also added new features like Matchmaker, which makes it easier for owners to keep track of all their purchased content that supports the feature. It also brings the option to download the narration for a title you own in just one click.

Amazon said it had also simplified the checkout process for new purchases to just one click.

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