How did you set the volume? Did you use mixerSetControlDetails? On which destination did you do the set/get? From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Dey Sent: Friday, August 11, 2006 5:10 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Mixer API support on Vista? Hi Larry, In my app, I tried changing the volume to 32767 on my USB audio device but still got 65536 when I read it back. I am still not quite clear about the "per-app" state of volume control concept? Does it really change the volume on my hardware? My company is doing USB VOIP hardware. Our customers like to directly adjust the volume in the phone application while a call is connected. Thanks! Mike ----- Original Message ----- From: Larry Osterman<mailto:Larry.Osterman@xxxxxxxxxxxxx> To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx> Sent: Wednesday, August 09, 2006 1:49 PM Subject: [wdmaudiodev] Re: Mixer API support on Vista? In Vista, the old hardware mixer is gone (ok, it's not gone, it's just really well hidden), and has been replaced with a "virtual" mixer that reflects the per-app state of the volume controls. In your case, the reason you're always seeing max volume is that nothing in your app has changed the volume from its default. For Vista, you have two options. The first is that you can apply one of the legacy appcompat layers to your application (note: this doesn't work in current Vista bits), which will tell Vista "my application is a control panel replacement and should be allowed to see the actual hardware values". The second option is to use the new IAudioEndpointVolume<http://windowssdk.msdn.microsoft.com/en-us/library/ms678753.aspx> interface to control the volume of the speakers. If you chose to go the former route, it's important to understand that the Vista mixer no longer lies about the topology of the audio solution on the machine - if the audio solution doesn't have a hardware volume control, then the mixer APIs won't return a hardware volume control. The IAudioEndpointVolume interface will correctly handle audio solutions without hardware volume controls though. Larry Osterman This posting is provided "AS IS" with no warranties, and confers no rights. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Dey Sent: Wednesday, August 09, 2006 1:29 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Mixer API support on Vista? Does Vista still support mixer APIs? I have a volume control application using mixer APIs (such as mixerOpen, mixerGetDevCaps, mixerGetLineControls...). It works well on 2K/XP. However, on Vista build 5472 the volume I got from mixerGetControlDetails API is always 65535. Anyone know what's the problem? Thanks! Mike