To get rid of the crackle when starting audio, follow the steps below:

~$ sudo apt-get update
~$ sudo apt-get upgrade

~$ sudo apt-get install git-core
~$ sudo wget https://raw.github.com/Hexxeh/rpi-update/master/rpi-update -O /usr/bin/rpi-update
~$ sudo chmod +x /usr/bin/rpi-update

~$ sudo cp /boot/start.elf /boot/start.elf.knowngood

~$ sudo rpi-update
~$ sudo reboot
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