Problem audio on TABLET with ANDROID

I builded a course with storyline and published it in HTML5.

I tried to open it on the tablet with ANDROID and Firefox.

I viewed the course very well but I can't hear audio.

The audio on tablet is ok.

Do you know if there is a solution?

Note:

Course builted  with articulate 9:

- Work well on Browser android

- Don't work with Firefox (it doesn't start)

Course builted with Storyline:

- Don't work with Browser Android (it doesn't start)

- View Ok on Firefox but  the audio doesn't work

Regards

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