Source: Steam
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Updates to the Source Multiplayer games have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Source Multiplayer
-Improved multiplayer voice communication, now using a much clearer codec
-First release of a completely reworked in game text chat to which now includes a chat history and a filter to only see important chat messages
-Fixed not being able to use sounds, decals or models if they were downloaded from the server
