Hi Pierre. I assume that the figures you are quoting are measured end to end ? What buffering latency does your KS code impose ? I found I was getting similiar numbers with the latest WinXP USB drivers and USB1 audio devices. ----- Original Message ----- From: Pierre Brisson To: wdmaudiodev@xxxxxxxxxxxxx Sent: Wednesday, June 25, 2003 3:14 PM Subject: [wdmaudiodev] Capture latency with USB card Hi, I am writing an application using KS. The application allows users to monitor the input. With a PCI card, I get delays down to 6-7 ms (measured with a signal generator and a scope). With a USB audio device though, the minimum stable delay I can get is around 20-25 ms. The cause of the problem seems to be the instability of the capture side. I measure the time between capture events and I get delays up to 20ms on USB where it should be 5ms. I am using Microsoft USB audio driver (latest version) and I heard that it can achieve better performance. Did anybody experienced such problems with USB audio? Thanks Pierre Pierre Brisson Adacel Inc. pbrisson@xxxxxxxxxxxxxxxx 450-672-3888 ext 335