I can think of three or four people at Rio who could write a multiband compressor with their eyes closed (and probably already have most of the filters required). Unless the license was very cheap I don't see much point paying for it - especially with the GPL implications if this has to be a hijack hack.

I doubt anyone has this technology totally tied up with patents - everyone and their aunt makes them, and there are freeware examples such as C3 (which I have an idea might even be open source). Of course if nobody has the time to write one then I guess that's a factor.

Rob