Application adjusts system volume in floating window.
Volume Slider is a simple Mac OS X application which allows you to control your computer's volume using a slider on a small window that you can place anywhere on your screen. Volume Slider has two components including (1) a small volume slider with a mute button on it, and (2) a resizable mute button separate from the slider which is useful for rapidly muting the sound.
What's new in Volume Slider
Improved compatibility with systems set to formats other than the United States
Added a menu option to mute or unmute the volume with a key command