John,
the older pyro (5?) was a ripper/CD burner. As I recall it had slip editing in the CD track and you could do fades etc. Also track naming/numbering. VST support was added and it came w/ basic Cake effects. It was a good commercial product (I used to see it in Best Buy, etc.) and that is what I used it for. The best thing was it had a quick song envelope so you could (kinda) match volumes which was important when I was burning home comps from albums, CD and mp3s. SF was more involved for that.
Pyro AC is a multi-module "all in one"" comercial product and does more. I've never figured out the editor part of it, not worth the time since I use SF for that process. I've never really dealt w/ Publisher, which is the same in other Cake products I guess. My website wants more money per month to do html inserts and I'm cheap - esp. when there are free sites I can link to.
The burner, encoder etc. work well, and the tagger is very nice if you have a "file" from vinyl you need to name - or your own stuff. Worth it just for that, tho I don't know Nero etc. since I mostly use SF. Pyro et al is just more convenient for non-pro work at times.
Also, I guess you need to have your interface running when installing. My Pyros have always defaulted to the computer speakers instead of my interface and I never found a way to change that. It might be different w/ AC but I don't have that on my music computer, only this internet/writing one which has nothing but the realtec card.
Whew! that is a lot for a program I don't use that much. I'm sure it is pretty good, but not up to SF (w/ all the cost differential there). I've asked Cake several times to "Pro" Pyro and hook it up to SONAR for editing, etc. However, they've never followed my advice. Imagine that. I also wanted Ford to make a flying car - not happening either.
;-)
@