VolumeLock
VolumeLock is an easy-to-use audio control utility that gives you the freedom in loudness control. With this program you can guarantee that the volume level of your PC will never be changed unexpectedly. ...
Cost: $12
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Trial version
Publisher: Actual Solution 
Descriptions
VolumeLock:
VolumeLock is an easy-to-use audio control utility that gives you the freedom in loudness control. With this program you can guarantee that the volume level of your PC will never be changed unexpectedly. By creating your own fully customized rules for any volume control you can prevent other applications from changing the volume suddenly. VolumeLock includes a powerful lock function, a scheduler, command line support, an ability to store and retrieve a lot of rule configurations via one mouse click or system-wide hot keys. It works with all modern sound cards and can be useful for home and power users alike.
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