I use a program called AVS audio editor - it shows a wave form for my video and I can increase or decrease the volume accordingly. It also shows lines where sound will start to break if the wave form exceeds. I had lots of different sound levels by the time the audio recording for my course was completed and this helped me normalise everything. I can even open a video with it and just edit the audio file. Once things are as I want them it recuts the audio back into the video track. I have a short brand video I use in each lecture and the audio in this is what i level againsts for consistency.
Thanks for your inputs, I checked out AVS website, AVS has a lot of good export options and features too. I am currently tied to a linux machine, so I use Audacity ( should have mentioned that beforehand), but anytime I get an opportunity to use Windows, I shall check out the tool.
In audacity, you get an idea about the decibel level of your audio when you record/play it ( a green meter) a similar one might be available on AVS too, havent got any idea though.
Hence I was asking for the max/peak decibel level for the entire audio track.