Hi Anirban,

Which version of MEP are you using now?

You need to read carefully the relevant sections of the manual. The use of the tools is explained quite well in the 2014 manual, better than I could explain.

You should get the audio onto a second track, zoom in on the sound wave and find a part with no dialogue, only background noise that you want to reduce. Set the playback marker there. Then in the denoiser, Advanced, Search for noise sample. When you hear one that doesn't have any dialogue, but has the background noise only, use it. It is very short so you have to listen carefully. Under Step 2, I uncheck Remove camera noise only, check Optimize for voice, and start playing with the Reduce noise. The manual says to reduce interference signals by 3-6dB, so I slide it down and try out 3 to 8. Any more and the result can sound tinny. Then you can move the Noise level, but mid-range is probably best. You have to listen and determine.

Again, that noise sample of what you wan to remove is very important. I have not been very successful using these audio editing tools.

The deHisser has virtually no controls and is only useful for a constant weak hiss.

I prefer to use the Music Editor that comes with MEP. You have to do a mix down and then select Edit externally and it will open the wav. The tools there allow better control of the location of the noise sample and over the parameters to set. You can even split up the wav file and apply the tools to only the affected parts rather than the whole file. I suggest that you try it. Once finished, just exit and save when it asks, and the wav file created during mixing down is replace by the wav modified by Music Editor. The Music Editor that I have with MEP2014 and later is version 3.

Better still is to use Audio & Music Lab 2014 Premium which has a large select of tools and much better control. That is what I use.