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You can use multiple sources in a session. Although only one source streams at a time, as you encode, you can switch between sources to stream different content. For example, before broadcasting a company meeting, you can set up sources for the main content as well as for welcome, intermission, and goodbye content. When you broadcast the event, you can start with the welcome source, switch to the main speaker when appropriate, switch to the intermission source during a break, and then switch to the goodbye source when the event finishes.
If you are using the Windows Media Audio 9 Voice codec in a multisource session, the mode (voice-only or mixed voice and music) of the first source determines the mode of the subsequent sources. For example, if you choose the voice-only or mixed mode for the first source, subsequent sources will be encoded in the same mode. However, if you specify the mixed mode for the first source and set up an optimization definition file for that source, subsequent sources in the session will be encoded in the voice-only mode.