Hello to all audio people! I have a problem which I struggle with for about a month now. Hope you can help me. I'm using the MSVAD sample as a base for my sound capture driver. I create two virtual sound cards which are connected to each other in such way: fist input->second output & second output -> first input. So, if you have two apps they can speak to each other. When CopyTo is called on the one sound card, I put the data to the FIFO buffer, then when CopyFrom is called on the other sound card, I just copy the data from that FIFO buffer. This works great with apps that use wave* APIs. But it does not work with DirectSound apps which use WDM capture and WDM render. Capture side sometimes doesn't get all the available sound data, so FIFO gets overflowed and I get clicking, skippy sound (it sometimes sounds like lownmower you know :)). I've noticed that the sound quality highly depends on processor load, i.e. when I scroll some text with the scroller on my mouse, the sound becomes horrible, but when I don't touch anything the sound is almost good (only skips about once per few seconds). After some investigation I found that KSPROXY.AX filter sends IOCTL_KS_READ_STREAM requests to my driver in some strange way (I think it's strange for streaming). It sends one ioctl once after each Notify() call in my driver. All requests are 1764 bytes long (this equals to 10ms of sound at 44100 16bit stereo). And sometimes when processor is loaded, it does not send that ioctl at all and here I get sound skip. So, my question is how to tell KSPROXY to send several IOCTLs beforehead to avoid skips? Or is there any property that I should set for my driver? Thank you all! -- Best regards, Yura mailto:spirit@xxxxxxxxxx ****************** 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/