Hi, I think I just found the answer to my question. a) WAVEOUTCAPS2 / WAVEINCAPS2 b) It seems you have to do some win98-style-devnote-filtering. Return 0 to Getnumdevs if the devnote does not match your device. Uwe ****************** 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/