It depends on what the analog button does. I think it mainly bumps up somewhere in the lows, and maybe it rolls off the highs a bit. If it adds harmonic distortion of some sort then, obviously no that wouldn't be emulatable. I generally keep the analog switch off if there will be more than one of the SSL plugs in the chain (and I often use the bus comp on the master bus), because they really add up and you can end up with a lot of low end boost.
Indeed he does.