There is one, it's by sandgolem. Or if your using the default battle system, you can look for this in scene battle 2
# If C button was pressed
if Input.trigger?(Input::C)
# Battle ends
battle_end(0)
end
And put
Audio.me_stop
It should look like this
if Input.trigger?(Input::C)
Audio.me_stop
battle_end(0)
Haven't tested it out, but it should work like this. When you press the enter button to exit battle, the ME (victory music that is playing) will stop.
EDIT: My bad didn't notice the VX sign. I don't know if this works with VX.