Subject: Re: That old chestnut ... From: Bob Masta <audio@xxxxxxxx> Date: Sat, 16 Oct 2010 08:33:41 -0400 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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 www.daqarta.com Scope, Spectrum, Spectrogram, Signal Generator Science with your sound card!