I forgot a very important issue: The basic system latency is the time delay since the interrupt to the app is notified. That delay is necessarily larger for the timer interrupt than for the audio one. It's that why I insisted in explaining that the timer interrupt does a lot more things than any other. Again, don't see it as processor time used, but as latency added. 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/