I wanted a piece of tremendously disturbing piece of classical music like Dvorak's New World Symphony, 4th Movement and I put something on there and it plays through both the splash and the animation.
I used a stopwatch to time the process from the moment the sound started playing back until I got to the unlock screen. It was about 22 seconds. So, I cut my sound clip off at 22 seconds and rebooted. It plays the sounds through both screens.
So, you might consider using a program like Audacity [http://audacity.sourceforge.net/download/] to make a splash sound, insert the appropriate amount of silence, and then continue to your next sound. I might do that for some alternative boot sound schemes. But, it should solve your problem.
Yeah, I figured that out awhile ago on accident. I also found that it is approximately 8.5 second from splash to boot ani. I used audacity and created a transformer transformation sound clip with an 8.5 second silence and used it with the decepticon animation floating around. It was pretty nice and went well with the theme I made at that time. Used it for a while now I just have stock boot with no sound.
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