--- Operating System, Graphics card ---
linux mint 15, geforce 9800 gt

--- Blender version with error, and version that worked ---
2.68a official

--- Short description of error ---
Audio strips in the VSE have all visual blend modes selectable under "edit strip" section of Properties.
The opacity value is also editable.

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
- Add audio file to vse
- right-click to select strip
- press N for properties