Hi Dugan, > Calling timeBeginPeriod does indeed have the same effect as calling > ExSetTimerResolution. > Ok, that explains the issue. I see the WMP indeed setting the scheduler frequency. > This is actually documented, albeit rather indirectly, at this page: > http://support.microsoft.com/default.aspx?scid=kb;en-us;306828 > Indirectly is a quite an understatement, I wasn't looking for the battery life of a Windows ME computer :) Thanks for your help anyway! Regards, Bart ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/