There are even further options to sync sound from within BS.Player:
(
(with a file loaded) rightclick >) Options > Filters > Advanced ...
... If sound is taken care of by AC3Filter:
~ Click on the [+]-sign of AC3Filter and then on "System"
~ Almost in the centre of the window there is an option to "time shift" sound.
... If sound is taken care of by ffdshow Audio Decoder:
~ Click on the [+]-sign of FFDshow Audio Decoder and then on "ffdshow audio"
~ Select/check the box "Delay" and set the delays as wanted.