Hi, When my USB audio class device is plugged in, I see two entries for this in graphedt. One is under the audio capture sources(KSCATEGORY_AUDIO) and the filename for this is qcap.dll. The other entry says USB audio and is under WDM streaming capture(KSCATEGORY_CAPTURE) and this has filename ksproxy. Which one should I use when I build the graph. What is qcap.dll? Hannah __________________________________ Do you Yahoo!? Get better spam protection with Yahoo! Mail. http://antispam.yahoo.com/tools ****************** 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/