Why is it I can not hear my reverse thrusters when I have them on / At one time I could hear them when they were engaged. I do not know what I might have done to cause them to go silent.. Any help on this would be great .Thanks. Roger

I have had this issue before. If you go into the FMC and then choose menu > PMDG setup > options > sound > device and check to see if your sound device has been switched. It needs to be the same as the default device in windows. This is what worked for me. Hope it helps.