How to stop FEH from pausing my music when turning on

I am listening to my favorite tunes and decide to play some FEH. I like to play it muted since the sounds got annoying after a while and I am listening to other game music most of the day. But when I turn FEH on it pauses my music. I have silent mode one as well as having all of the sound sliders muted but nothing seems to help. I didn't see any other options which seem rea

This is a minor issue but if there is an simple solution I have missed I would appreciate it.

I am on an android device (Nexus 6 if it matters)