Unfortunately, due to the powers that be audio cannot be added in the same way as video. So you cannot preview the audio inside of Hype. I believe it's being worked on and will be changed in the future (Don't quote me on that)
So, that causes a problem when trying to sync your animations with the audio. That being said there is perhaps a workaround but it's a little complicated.
- convert your audio to .mp4 and then add it to your project so that you can use it like video
- use the following information to sync it yourself assuming you know the exact (or near) times each part of the animation fires. (column on the right is seconds shown in decimal)
I would personally go for option 1 as it's much easier.