Going off what Aurora Paradox just said, there is a minor bug with the mod.ini. The way the 1.1a patch is configured, many of the new weapons lack sounds. If you open up the mod.ini and switch the secondarylist around so that the main Shadow Genesis release is in front of the MediaVPs, the problem is resolved.
Your mod.ini in the "Shadow Genesis 1.1" folder should look like this:
[launcher]
modname = Shadow Genesis
image255x112 = ShadowGenesis11.bmp;
infotext = It is the year 2390. Lieutenant Nathan Miles is reporting for duty in the Terran 6th Fleet, commonly know as the Wolf's Fleet. 6th fleet operates as a semi-autonomous defense force for strategic systems within the Wolf's Group, a heavily colonized sector, where multiple Ancient ruins have been discovered. Human- and Vasudankind are protected by their powerful navy, but despite the frontiers secure, unrest has begun to grow. A mysterious terrorist organization called Cerberus Legacy is rapidly spreading its influence within the GTVA, and their leaders are plotting a conspiracy that may lead the Wolf's Group to the brink of destruction...;
website = none;
forum = http://www.hard-light.net/forums/index.php?topic=83942.0;
[multimod]
primarylist = ;
secondrylist = Shadow Genesis,mediavps_3612;