if i were in a position where i could not judge altitude with my eyes using either the ground or a fancy barometer, i would give an EXTREMELY aggressive wave off and then pull. that would make the audible superfluous.
visual altimiters give you the luxury of knowing how much time is left before break-off, or pull time, or decision altitude. an audible is just a different version of a mall directory, it only tells you, "YOU ARE HERE".
blue stuff,
p.j.
pulling is cool. keep it in the skin