An on-screen display that shows volume bars whenever you change the
volume. They go away after a moment. See the screenshot for a better
idea.

Compile with: gcc aosd.c -lxosd -lasound -oaosd

This was designed purely for personal use on my machine. It may not
work anywhere else. If you've got problems, feel free to e-mail me,
but I don't promise to respond (depends on how much time I have).