VolumeMixer

VolumeMixer screenshots

Volume Mixer is a free-to-use app that allows you to control your Mac volume.
VolumeMixer 1.1 : Main Window

Alternative downloads

Stellar Volume Repair
3.0
Repair corrupted volume information on Mac.
Volume-Scroll
1.0.17
FREE
It lets you use your scroll over the menu bar and change the volume.
iTunes Volume Control
1.5.2
FREE
Control the iTunes volume.