Hi guys, i've just posted this on Avsim.
http://forum.avsim.net/topic/331236-pss ... er-sounds/
A lot of threads i read in the past said that the GPWS and other stuff coded into the PSS gauges could not be altered, i found out however the files they used were a resource stored within the gauge file, they weren't coded in so therefore can be modified fully. Basically if your sick of the old sometimes wrong PSS GPWS, Seatbelt, AP Disconnect or any other sounds the PSS series use then follow my guide to change them. Once you've done it once it literally takes a couple of minutes to do it for another product. All you need to do it is a soundset with the callouts (many are available from Avsim) and a couple of free programs.
I have tested it with the following PSS products with no problems - 777,757,A320,330/340
If you need any help just give me a PM and i'll answer it when i can.
Cheers!