makes me think of what the prototype half life gravity manipulator would have sounded like, the initial beep notifyiing of a lock-on, and the second sound being the device being activated and holding onto whatever its locked onto.
Hi, I've used this sound here . . . https://soundcloud.com/#luckylittleraven/carnivorous sorry i don't know how to make that a proper link but thanks for the awesome sound! (you have of course been credited)