Demuxing 6 ch AC3 audio

[NormaJ]

Hi all,
I have been asked if there was a tool for getting a 6 ch AC3 Spanish audio, starting from a 2.0 Spanish AC3 and the English one, 5.1 ch.
As always, googled, and found out this:
http://www.mediatwins.com/en/products/ac3tools_pro/index.html

Sounds great, what do you experts think?
Thanks

[SLK001]

HeadAC3he will demux AC3 audio into separate WAV files (but it muxes the results together - you can use any demuxing program - like multiwav to demux again). Then use any 5.1 AC3 encoder to create your Spanish version.

[SLK001]

And, this all can be done with free tools.

The AC3tools package does look nice, tho. I don't know if it produces compliant AC3 streams.

[NormaJ]

I thank you very much for your replay, I really didn't know that HeadAC3he could do this. Did not use it for a while, now. So please, could you give me some directions on "how to", or even pointing me to a tutorial where I can take a look?
I very much prefer free tools, too.

Thanks again