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Re: That old chestnut ...

On 15 Oct 2010 at 14:27, Stuart Rosen wrote:

> Has anyone had any luck in trying to control ~all~ of the sound volume 
> controls from Matlab in Windows 7. There appears to be an over-riding 
> volume control not readily accessible within a particular application 
> window.

I'm not a Matlab user, but the normal way Win7 handles 
audio is that everything is "virtualized".  Each open app 
gets a share of the virtual pie.  If you right-click the 
speaker icon in the system tray and select "Open Volume 
Mixer" you'll see a master control on the left marked 
"Device - Speakers", then one marked "System Sounds", and 
then a separate fader for each open app.  I assume Matlab 
has its own fader here, and is unable to control the 
others.  (My understanding is that Win7 does provide a way 
to allow developers to gain total control, but it's not 
normally done.)

Hope this helps!

Best regards,


Bob Masta
            D A Q A R T A
Data AcQuisition And Real-Time Analysis
Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!