You might want to check this tutorial. I followed it and gave me good results:
Hector
On 12/22/06, Pelle Nilsson <pellenilsson(a)fastmail.fm> wrote:
"Jesse Chappell" <jesse(a)essej.net>
writes:
One solution is to use ac3jack (
http://essej.net/ac3jack )
which encodes AC3 from multichannel jack inputs.
Thanks, looks like just what I need. I'll just connect Ardour's tracks
to ac3jack's inputs.
/Pelle