Audio improvements in Adobe Premiere CS6 and categorized

I would like to know more about the audio usage in Premiere CS6. What are the audio formats that can be used in this software? What do you mean of dB? What about the audio meter panel? What are the new features of audio meter? How many audio tracks available in timeline of this software? What does DSLR means in CS6? What is the purpose of including this function in this software? What are merged clips? Can we connect different clips and combined it with different audio files?
Please help me with this.
Thank you!
