Hypercube transcoder can transcode various audio format
to MPEG Multichannel. You can build your own 5.1 SVCD with
this tool.

big improvement in this release:

- DirectShow filters are now supported (including DMO filters) 8)
- output bitrate can be changed.
- output as 6 RAW PCM files is now possible.

http://hypercube.is.dreaming.org