Rui,
I am going to quote from The Official Obsidian Strategies and Secrets. It says:
"There is no simple answer for this puzzle. Using you hand-eye coordination, you must make the lightning strike each post at the same time that the corresponding branch does.
Watch the order of the lightning strikes. Then adjust the timing of the branches by clicking on the posts beneath them. Finally, click on the lightning cloud at the precise time to start the correct sequence.
If you synchronize the lightning and a tree limb incorrectly, you will hear no musical note. If you are correct, the lightning strike will produce a musical note."
I suggest working on getting the first one correct. For the second one, watch how the first one hits, then hold down the second one and release it right after the first one hits. Test it with the lightning until you have the first two. Work your way around the circle until each one is coordinated with the one before it. (It should remind you of someone drumming his fingers on a table-1, 2, 3, 4, 5-one right after the other).
Lady K.