My new club install has a Scene setter on the front lights and I am adding my scene setter to control the rears lights and would like funtions such as "Blackout" "Chase" "Audio" on one board able to control both boards.

I am sorry to say that you can not link two consoles like Scene Setters so that one can control the other and visa versa. I would look into using one console if you want to have one think control it all. If you are looking for more control, I would use two consoles then.

Nope.. what you need is a DMX combiner or Merger.
The only company I know who makes this is Doug Fleenor.
Price is around $1500 - $2000.00 each.

We have a Merger, but it does not master slave them. Ours allows you to have 1 scene setter be channels 1-24 and the next scene setter to be channels 25-48.

Best regards,