My QOS was not happy this morning.  [Running P3Dv3.4] Started a flight/session as usual (J3 Cub, secure engine), and loaded up a KLM GE Equipped 744. Set Panel State to 'LONG.' Everything appeared (visually) to correctly set the LONG state, except for these engine sounds made when at idle. Instruments indicated the engines were secured. Upon external inspection, the GE's spooled down to a stop, however, still aurally heard idle engine sounds. Cycled 'Q' several times in different views, with no success. Rebooted several times selecting SHORT, COLD/DARK and even manually secured engines, with the same results. I am puzzled. Any ideas?

35 minutes ago, N501EA said:

Started a flight/session as usual (J3 Cub, secure engine), and loaded up a KLM GE Equipped 744.

That could be a problem.  Please review the Introduction document section on using P3D again and note that the only way to start a session is from the Scenario Setup screen (check the always show on startup box).  You do not want another aircraft loading and then loading a PMDG aircraft.

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2 hours ago, N501EA said:

Any ideas?

In addition to what Dan wrote, try tapping Q twice to cycle the sound engine (in the sim) off and then back on. This usually fixes any sim-based anomalies.