Hi Pierre, >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? > I had similar experiences. The events I was waiting on were being signaled at such uneven intervals that my latency was fairly unusable - it would tick along regularly for a while (every few ms, corresponding to my buffer size), then I'd suddenly get a delay which was greater by at least a factor of 10. Although this problem seemed to be more significant when I added capture, I don't recall verifying that it was explicitly because of the capture side, as opposed to a result of running capture and render together... Sincerely, Andrew Sherbrooke Art & Logic Lead Engineer, Audio/Media Development asher@xxxxxxxxxxxx www.artlogic.com ****************** 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/