To call a scene on any page with midi you send a controller message with the page and scene number in the message. Hex message: B0 00 00, would call scene 1 on page 1. Hex message B0 01 00 would call scene 1 on page 2. The first byte is B0 (controller on midi channel 1), second byte is page, third byte is scene. The page and scene start at 0 so it's always one less than the actual page and scene number.