Syncing animation to audio from button trigger

Hi all, still a newb here. With the house empty of kids for once, I was finally able to get my voice-over audio recorded, which brings me to the next stage of my very first Storyline project.

I am building for the iPad, which requires launching audio on each slide, so I have my audio triggered by a button. The button trigger works nicely and the audio is working great.

The problem I'm having is that the animations on the slide need to time from the start of the audio, not from start of the slide. The timeline appears to only start from the slide.

What's the best way to accomplish this? 

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