Sound support is broken since rev 20581

Installing a soundblaster driver (according to
http://www.reactos.org/wiki/index.php/Supported_Hardware/Sound_cards) with rev
20580 works fine: WinAMP and MPLayer both play sound. Trying to install the
same drivers with rev 20581 or higher fails (winamp and mplayer hang after
buffering several blocks of sound data; no sound is played).