Hi! I have a USB Audio device, that can be accessed through the standard windows wdmaudio.sys. This device is not a real sound card, instead it is a signal generator, and an oscilloscope (both working in the audio frequency range). It works fine, I can handle every needs using WinAPI functions. How can I get exclusive rights to that device in my application? I want to exclude every other attempt to access that device, (at least) when my application is running? The main problem is with Windows system sounds, because windows plays those dings and other sounds on this device, if the wave mapper is set to it. (If there is no other sound device exists in the system this USB device will be the default one!) (The supported operating systems: Win2K, WinXP) Bests Tom ****************** 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/