Background audio volume issue

I have managed to add background music to my entire project thanks to wonderful help from Ned in this thread. I reduced the volume quite a lot so it would play quietly under the voiceover however I've since discovered that it doesn't reduce it at all when you play the project on a phone to the point that you can't even hear the voiceover the audio is so loud! Does anyone know of a workaround for this?

Thank you!

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