Modded with new sound
I just made a little "mod" of this excellent bootanimation (hope OP doesn't mind)..
I've replaced the bootanimation sound with the new sound from some samsung galaxy devices, which I adjusted to coincide only with the Xperia Logo, but not with the blue part of the animation.
Here's the link: http://d-h.st/8ZG
, and as in the OP, just replace and give right permissions in /system/media