There is no **official** API for anything gray-scale Kindle.
These devices run an OS implemented by Amazon themselves.
Your info. box lists "Voyage" as the device you own.
How are you going to listen to anything?
In case you haven't noticed, your Voyage does not have any speakers (or other support for audio media).
The last Kindle (grayscale) model that supported audio was the Kindle Touch (called: K5 here).
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