Well, if you encounter sync-problems, that's the place to be. Or start with those values all set to zero, and see if the general delay (in A/V-settings) will do the trick.
Be aware that audio-syncproblems can originate from two sources:
1- (some) channels can have a sync-problem. If so, the correction values are likely to be different for all those channels;
2- depending on the TV and the resolution-settings of the box, it is possible that the TV-picture is 'behind' audio, due to all the hard work that has to be done by the TV. If this is the case, the out-of-sync value is likely to be the same for all channels (or at least for channels that do not suffer from point 1).
Thanks, I set all the values to 00000. And the problem is nearly gone. Maybe not perfect. Is this some sort of auto correction? I have never changed this values that I just set to 00000.