Hi Shiv,
Each of the tracks are different and people do tend to come here stating that they like this one and don't like that one etc. including the demo track. (a quick search of the forum should bring up such threads for you).
Often, people have a problem with some tracks because they have the volume too high when meditating with them. You could try turning the volume down so that it's barely noticable, and even still the entrainment beats will be audible to your brain and work. You don't have to be consciously aware of the beats happening.
Personally when I meditate with the lifeflow CD's, I have it just playing quietly and my awareness goes to my mantra to take me into the meditative state, so the entrianment track isn't even something I'm focusing on or care about, as it will just do what it needs to do without me interfering with it.
Hugs
Giles
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