Hello Chad,
thanks very much for identifying the 'rogue' file - rather than deleting it, I edited the file (with the free 'Audacity' programme - changed the output level and exported a new 'quiet' version- now I can just hear the beacon with engines off, otherwise not at all.
Now the only (well major) remaining annoyance is lack of audible landing sounds - IE tire sounds at touchdown and rumble afterwards.
Cheers,
Ray