PNMixer is system tray sound mixer. Running with the HighContrast theme it looks like this: (or with volume level enabled)
PNMixer currently supports ALSA and Pulse audio. It is written in C, depends only on GTK+, and does not require Gnome.
PNMixer integrates nicely into desktop environments that don't have a panel that supports applets, and therefore can't run a mixer applet. In particular it's been used quite a lot with fbpanel and tint2, but should run fine in any system tray.
PNMixer is a fork of OBMixer with a number of additions. These include:
Latest version is here
This version adds the following (as well as fixing a number of bugs):
The previous version has the following new features/fixes:
Running in the tray with HighContrast theme:
Running in the tray with HighContrast theme with volume level enabled:
Left clicking the icon brings up the master volume control. A full mixer is launched by clicking 'Volume Control':
The various preferences tabs:
Defining a new HotKey command: