Downmixes from stereo to mono file for mono encoding in OGG Vorbis format.
This property is used only if the EncodeFormats.FormatToUse property is set to ENCODING_FORMAT_OGG.
This property is the same as entering the --downmix setting inside the Appendix B - OggEnc command line.
For further details about encoding in OGG Vorbis format refer to the EncodeOGG class section.
For further information about available encoding formats see the EncodeFormatsMan class.