I have P3Dv4.5, When I loaded up a flight today with the Electra 10A I could get no sound. I checked all the settings and everything looks good. I tried other airplanes and sound was as usual. Other programs, music, videos all have sound. Only this Electra has no sound. Like the speakers are unplugged. The last time I flew the Electra was yesterday and the sound was fine. What could this be?