About to flash rom, have a few questions.

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http://androidforums.com – Alright, so I've had my phone rooted for a while now and I think I'm ready to flash my first ROM. I'm currently on stock and think I'm going with AOKP 4.2.1 Build 2. It seems like it has all the features I'm interested in. I just have a couple of questions. I'm assuming a "clean install" is essential here? In doing a clean install, I understand I'll lose my apps and all that, but will I also lose my media (pictures, music, etc)? Or how about my Titanium backup? I've completed a nandroid backup. I'm currently running a Titanium backup of all my user and system apps. I read somewh (General)