All 960 positions sound?

Hi 

I was wondering if all of the 960 positions are sound or if someone has discovered a win/advantage for either colour right from the beginning in some positions.

For example, do some of the positions allow pawn or piece advantages that cannot be avoided?

My question is a result of another question I had asked myself. Can tournament organisers provide any of the 960 positions as a starting position without extensively analysing that position?

So far it hasn't been proven that any starting position in chess960 has a "major" advantage for white over black.I have tested them all on Fritz edit position option. And none came to be of significance.

However, their might be subtle positional advantage in certain that needs white to play a flawless game in order to convert them into a substantial advantage.