How does android increase the starting ringtone and android increase the ringtone?

How does android increase the starting ringtone and android increase the ringtone?
The AudioMtkPolicyManager. cppICS version is AudioYusuPolicyManager. cpp.
# Ifndef BOOT_animation_volume
# Define boot_animation_volume (0.25)
# Endif
Change the value here to # define boot_animation_volume, and the maximum value is 1.
How can I increase the ringtones of my Android phone?

There is no better solution at present. If you want to increase the volume of the ringtone, you should go to the next MP3 volume gain software on the Internet, and process it on your computer and then get it to your mobile phone. Mp3 gain
 
Set android boot ringtones

If you think too much about this, you have to root and replace the corresponding file in the system file, but different models are different.
However, when the phone is turned on, there is almost no need to shut down or restart it. What is the significance of setting this ringtone...