Attack dependant decay/sustain

[Carlos Vila Deutschbein]

I just had an idea and I would like to know if sombody else has thought
about this...
The idea is to do an attack dependant decay/sustain. Normally, in acoustic
instruments, decay happens with fast attacks due to the inertia of the
interpreter or the instrument itself. But if the interpreter forces a slow
attack (imagine a flute or a violin) there is no decay before the sustain
phase. Based on this, wouldn't it be nice to modulate decay time and or
sustain level depending on attack time? 
Has any manufacturer implemented this?
It would be easy in a digital design but in an analog one?
Just thoughts... 
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Carlos Vila Deutschbein       si04697 at salleURL.edu
Enginyeria La Salle     www.salleURL.edu/~si04697/
-------------- Barcelona, Spain ------------------