RWR Sounds

Hello guys!

I have a question, does anyone know how the various bleep sound are chosen?
What I mean to say, What kind of system is there in the pitch and such between the various sounds played when some radars are tracking or searching the Aircraft.

And for my persnonal computer pimping, does someone have such RWR sounds or knows where I can download them. I’m A bit sick of the windows error sounds and maybe a sound of a SAM lockon is a bit better!

Regards:)

pleuris