Air Condition Files

[Skybus2000 8]

HiI am running the Fs9 PSS 773, and wondered how I can modify sound files, for example,When I turn the PACKS OFF, you hear the Air Conditioning sound slowly fade away until it stops, and vice versa, when you switch the packs to ON, you hear the sounds again. I have a sound file I want to use but despite switching the APU and Packs off, you can still here the Air Condition Sounds, even when Engines are both Shutdown and Batt Switch also off.Also does anyone know where you can get hold 777 chime sound files, the sort of sound you hear when the ACARS messsage sound in real life.Thanks