спасибо забугорцам... есть простое решение
http://forums.fluxmedia.net/general-...al-output.html
http://www.chrisnet.net/apps/VolumeTracker.zip
Цитата:
http://www.chrisnet.net/code.htm
Volume Tracker - Great for systems using Digital Audio Out, such as SP-DIF. With Digital Audio output, only the wave volume effects the output level, not the master volume. Yet multimedia keyboards and remote controls only adjust the master volume. This app tracks the wave volume to the master volume by monitoring changes to the mixer control. Works on 2000, XP and Windows Media Center. Note that it will not work correctly with Vista due to changes in the audio mixer architecture. When I figure out a way to make it work in Vista I will post it here.
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