Only have 50% volume

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http://forum.xda-developers.com – After rooting my phone yesterday I got a little delete happy and deleted a volume warning file with titanium backup. I'm certain it's the file that would drop the volume then display the damage hearing warning. Is there a way to just reinstall that particular file? Where can I get it? Where do I put it? Thanks to anyone who has the explanation. If not I'll just reinstall the OS and re-root. Phone: Xperia LT30P OS: 4.1.2 (HowTos)