Presentation - Audio Autoplay in Moodle

Hi, 

I have recently created a presentation in the Moodle plugin which has audio on each slide. 

This audio should autoplay and does for slides 2 onwards, but not on slide one (despite being set to do so).

However if you return from slide 2 to slide 1 it will autoplay.

I have been using Chrome but it happens in Firefox too.

I'm afraid I don't know what version of the plugin it is.

Thanks,

Emma