The attached .ZIP file contains a modified version of the Expression Encoder "Silverlight Default" player template with a new Playlist parameter feature "StartAudioVolume" -- this allows you to specify the audio volume at start up.

Inside the .ZIP are two main folders:

 -- SharedV4SP1 -- which contains the modfied copies of Playlist.cs and MediaPlayer.cs in the sub-folder MediaPlayer

--  Templates -- which contains the sub-folder "Silverlight Default -- with Audio Volume On Start"  which contains a modified version of "default.html" which provides a parameter in the Expression Encoder UI allowing the start up audio volume to be selected from a drop-down with values of 1 through 10 -- to select silent start up -- please use the existing "Muted" checkbox.