Audio or No Audio?

I have a question concerning whether to use audio or not.

I have a Storyline presentation with some rather lengthy software demos embedded into it. I have speech bubbles on most slides, but am wondering if I should include spoken audio with the speech bubbles. About 1/2 of my users will have access to headphones, while the others may or may not.

What would the benefits be of adding spoken audio?

Does anyone have any great ideas?

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