I am using a 740 with the Bose A20 and a Stratux. I set the Bose up to give priority to the input from the 740 thinking that the 740 audio would interrupt the music that I was listening to on my phone over Bluetooth. Set this way I get no music when the 740 is plugged in. Is this normal? It there a way to listen to the phone music via bluetooth and have the iFly messages overide it?