Don't continue audio from base layer when moving to new layer

Hi there,

I just created my first Articulate Storyline Course and encounter the following issue.

I have a slide with a base layer and five additional layers on top.

Each layer has audio. When I preview the slide, I can hear the audio on the base layer.  If I decided to click on one of the other layers before the base layer audio is done playing, I hear two audio streams. One from the base layer and one from the layer.

How can I prevent this from happening?

Thanks,

Bianca