> if the underlining audio WaveRt miniport driver supports IMiniportWaveRTStreamNotification Thanks for the note, Cheng-mean Oh my bad, I think that's too important to make it optional. I hope all quality audio driver implements it, and I think it should be strongly recommended. Jose Catena DIGIWAVES S.L. ****************** 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.com/