Silent Running silences the background music while in stealth (works for Druid Prowl also) making it easier to hear combat/stealth detection noises.
To change the level of the out of stealth sound volume just type /silent (and then a number in between 0 and 1. Default is 0.5
Or to disable the addon in game enter a 0. To turn it back on just reenter you preferred volume setting.
1.1.4 - Bug Fix
1.1.3 - Added the ability to turn the addon of by setting the volume level to zero.
1.1.2 - Back to English only until I can fix it and added /silent slash command.
1.1.1 - Updated ToC for 4.0.1 patch.
1.1 - Updated the addon to work with non-English clients.