Inside this zip is 2 files, bootsnd.sh which needs placing on the root of your SD card and a flashable zip.
After extracting both files onto your SD card and moving bootsnd.sh to the root of your card reboot into recovery and flash the soundatboot.zip, then restart the phone open up terminal and type the following.
Reboot and a sound should play as your boot animation begins.
Now here's the fun part, the file it creates a link to is located in /system/media and is an mp3 file which means you can change it to whatever you like just by replacing the file with root explorer, just remember to rename it the same and set the permissions correctly rwrr.
Sent from my HTC Wildfire using xda premium