Expression Encoder Video Overlay Volume

 Adjusting the audio volume of a video overlay is little obfuscated in Expression Encode 4.  

Here's how to edit the volume levels of video overlay

In Expression Encoder 4 goto Windows -> Enhance (choose)

Now navigate to Enhance tab and mix your overlay audio relative to the master video/audio track. 

1. Visual overlay audio volume can be set from 0-1. You can use decimal (.111), but only 1st decimal place (.1) will show. Adjust accordingly to mix you volume levels.
2. Master video/audio volume of the default video, set accordingly.