The beats are there, just that they are masked with the noise, however your brain will be able to distinguish them even if you can't consciously pick them out.
They can be heard on some of the tracks if you turn the volume up a little (not whilst meditating with it of course), and you manage to 'tune in' to them, but the point of the tracks is not to make the beats obvious to the conscious mind.
See Raven's post (#16) on the following thread:
A question or two about Lifeflow...
Hugs
Giles