[OC-Cougar]

Well Bill, you are a God's send. I went into the IL-2 setup file as you suggested. Although I did have "Heaphones" selected under the "Sound" Tab, my 3-D engine mode was set at "Balanced". I changed this to "Default" setting (as you suggested) and then took my P-40 and Spitfire for a spin. Well what a difference. Much appreciated Bill.
And 'Laughterislost', give it a go with hopefully the same results.

Cheers,
OC-Cougar