Raise volume levels to a sane and audible place

@Albinoman887,

Since people keep asking about fixing the low volume levels in your thread, I have put together this pull request to address the underlying issue. There are a lot more details as to how these values were reached in the thread I mention below.

These modified values are based on the suggestions found at: http://forum.xda-developers.com/showthread.php?t=1389756

Thanks,
-- robbie