DJ and Mat, The ultimate goal is to make available to the end user the ability to easily change volume and mute options through the control panel and have connectivity with other applications (one example is PowerDVD in which the volume controls are not functional unless I have a master volume control, whereas applications like Windows Media Player 9 seem to work with the system mixer controls). I understand that applications like PowerDVD probably only query the master volume as opposed to the system mixer through DirectX in some way. The problem is that is there no 'simple' way that I have found to bring up the volume controls or link other applications into the system mixers controls. We would like to have the little speaker icon down in the tray so the user can double click it and bring up sndvol32. We would also like to be able to change the options in the "Sounds and Audio Devices Properties" control panel under the 'Device volume' and 'Speaker settings' options, but these are disabled unless we have a master volume control implemented. We would also like to support these other applications that only support the master volume option. As I said in my last response it appears that setting to volume on the device may not be an option (although I'm still looking into it), so am I basically stuck with the system mixer as my only option until the chip supports the commands necessary to control volume and mute? Thanks again, John