I heard you can do it ..but how?
You can download enhanced RedAlert Sounds, from where I can't remember but that would do it, I'll look around and see if I can find you a link.
Try this on BCFiles
brandon_trek I have made a Voyager style RED ALERT with a total of 10 klazons (beeps). I can E-Mail it to you if you wish.
Just let me know if you want it.