lg g4 mod help

i wanted to find a way to do this but i dont see whats been modified to make it happen
on my g3 i can skip my music useing the vol. buttons thanks to the g3 tweeksbox.

is there a way to mod some code or make a code for the biuld prop so the g4 can have that holding the vol. buttons down to skip tracks. so how do i do this. ware do i go

thanks