AC97 / ES1370 : Slow audio playback

On latest version of Qemu for windows (i've not tried on Linux) 0.14.x and 0.15.0 rc0.. after installation of ES1370 or AC97 (ac97 on old builds.. currently doesn't work)
The audio is played very slowly (like a sort of slow motion... audio-applications are also slowed when audio is played)

win2k/XP/Linux are not affected by this issue.

i've waited 0.15 preliminary release (of qemu) to open bug just to be sure that this is not a temporary qemu-regression...