If you find the boot sound as annoying as I do, here are the steps to disable it:
First, enter in Recovery Mode, and connect to your phone with adb.
Mount /system (from the recovery menu, or with adb: mount /system)
Then, just rename the sounds:
mv /system/customize/resource/android_audio.mp3 /system/customize/resource/android_audio.mp3.nosound
mv /system/media/android_audio.mp3 /system/media/android_audio.mp3.nosound
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