All of the above plus:
Repeating hold on fills until pressed again.

Ability to change entire programs of voices on the fly without missing a beat.

Choices of control parameters available with EC5 pedal(a must have for me).

There are so many I can't even think of, or know yet.
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact