I am posting this here as I see someone else has posted the same problem to the flight1 support forum some time ago and has not received a response. As detailed above I cannot hear any master caution warning sounds with the IK DC-9 only the warning lights work. I have tried uninstalling and reinstalling as well as cross referencing everything with a friend who has the same aircraft and everything appears to be in order. My friend gets all kinds of buzzers and alarms with master cautions and I get nothing. I know of others that have the same problem.Anyone out there had and been able to sort the same problem?I have checked that my hardware is fully functional and there is not a hardware problem. I have also defragged the disk after removing all traces of the installation before running the setup again as well as redownloading the installer and no matter what I try I still have no warning sounds.All help gratefully appreciated.

Did you try running the configuration utility...?