if you go to any professional concert or music performance like Madona or Justin timberlake or Jlo mariah carey, just listen to the musicians!Can you tell whether they are playing all the instruments live or triggering off arpegiators with their feet or sequenced parts that they are playing live to etc ? I bet you cant ! Neither can the audience!

But they all assume that there must be a certain level of skill employed to make the great sounds that they are hearing.

I agree with Graham "Is everyone of us looking into this too deeply. At the end of the evening if everybody feels they have had a good nights entertainment....which is the reason they attended in the first place.... then the goal has been achieved regardless of the keyboard played. The keyboard player and his reaction with the audience makes the performance.