Control volume in app

I am trying to control the volume within an app but I can’t seem to figure it out.
On my player page, I am using howler player but there is not an option to control the device volume. Does anyone know how I can do this?

I am also trying to figure out how I can make a track rewind and fast forward 10 seconds, if anyone can help with this please let me know.

Thank you!

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