Default Using Bluetooth and Headphone Jack simultaneously

Ive searched far and wide for an app or mod to route audio through both bluetooth and the headphone jack at the same time but have come up empty handed. I really want to find a way to do this I have a JBL charge speaker for bluetooth I want to be able to hooke my phone up to my friends wired speakers and connect to my JBL so when I cant be near his speakers I can take the JBL with me and continue to listen uninterrupted if anyone out there knows where in the software media audio is routed and can make this happen for me I would greatly appreciate it also if your a Dev and and know this cant be done please let me know so my search will be over thank you very much

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