Actually it is just the iOS apps that support Kindle ebook multimedia. None of the other apps, to date. I think there are some technical issues with Android (or at least the older versions thereof) but there should not be any for K4PC or K4Mac (but still they don't support it).
There are some issues with the implementation of audio even in the iOS app. For example, one of my 'enhanced' books does not allow one of the audio links to be activated because some 'popular highlights' overlay it (and there is no way to turn off the highlights apparently). Also if the screen locks, audio playback stops. So you have to keep touching the screen to keep that from happening (usually screen lock happens automatically to conserve power). "Jacqueline Kennedy" has audio segments that are around an hour long. The text is basically just a transcription of the audio, so it is nice to follow along (turning the pages manually), but it doesn't happen automatically (like 'read aloud' in iBooks). But why can't I just lock the screen, save power, and listen? Finally, if you leave off listening to the audio to read another book, it doesn't save your listening status/position, and there's no 'scrubber' to indicate how long the audio is or to randomly access it if you want to pick up in the middle. So you have to just start at the beginning and stay with it to the end in one sitting. "JK" may be an extreme example, given the length of its audio segments, but it's something the iOS app designers did not anticipate.
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