Bulldog, The coops are not the place the ask this type of question, I know your new so no problem this is not meant to bash you. Remember there is no silly question
. The best place to start is to check out the Wiki You are not allowed to view links.
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Login it explains the controllers, then you can jump on that controller section on this site. It's not your question does not want to be answered it just clogs up the coop threads and makes it harder for the person running the coop to keep track.Hope you understand. Your post will most likely get moved at the very least removed from the Coop section.
Sort answer no, the Express is self contained 16 channel controller and it cannot control SSR4 only the Freestyle can run the SSR4. Or the SSR4 can be turned into a SSR4 DMX as a Standalone 4 channel controller. If your doing arches normally they have 8 channels per arch and the arches are usually pretty close together or at least two arches together so I would use a Express. It has a lot of extras that the other controllers don't have as you'll find out once you check out he Wiki hope it helps.