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If you are sourcing from audio that is entirely or primarily voice, you should use the Windows Media Audio 9 Voice codec, which is designed to encode voice. You can optimize the codec behavior by identifying if the content is voice only or if it also contains some music. If the audio is a mixture of voice and music, during encoding the codec automatically uses the appropriate algorithm to optimize encoding for the content (voice or music). Or, you can create an optimization definition file, which is a text file that identifies the places in your file where music starts and ends. The unspecified portions in the file are treated as voice.
If you are using the Windows Media Audio 9 Voice codec in a multisource session, see Using multiple sources in a session for information about codec behavior.