Finally I got my Trinity back...but in a smaller version, this time is a rack

I sold my Trinity two years ago and now I bought a Tr-Rack, which is really good as the Trinity was.
I'm sorry to tell that I can't find anywhere MSB and LSB values for selecting programs/combi from the master keyboard.
Can you point me in the right direction, please?
Maybe I missed something in the manual.
Well, just a nother question...Is it possible to switch from Prog to Combi mode just using standard midi or I need to use SysEx?
regards