Thanks to all for the comments.
I know sound in this case should not be taken as rocket science.
However, I (think I) do get the feel of what it takes to pull a kite by watching those videos and hearing the actual kite sounds (even if controlled by cyborgs...).
Please consider the fact that, as I said at the beginning, I have nobody around to watch live how s/he flies a kite. So I have to rely on three guys, me, myself and I, to figure out how to do it all and these three blokes know very little about kites. So videos with background music help but once I have started to hear the actual kite sounds I have felt like more connected (or closer) to the images and to my own sensations when flying.
The sound of the kite is part of the experience. There are some kites I like to fly just because I like the roar they make