Classic British Flight Sim

Thanks guys, I thought I had the latest drivers for my soundcard wich I obtained from the creative web site but using the drivers I downloaded from the website OneMacGuru stared me too has seemed to have fixed the problem. I had a good fly in the Hawker Siddely last night with no hiccups so
I hope ...

Hi Guys. First time on site. I installed Rick Pipers Hawker Siddley. Normal sound goes for a little while then all of a sudden the engines sound changes to a high pitch wine. This mainly happens when I cycle though the views.
Unless I restart fs9 again any plane I choose to fly has the same high ...