Loving Ghosts!
I’m now exploring the ghost using a MIDI keyboard. Would be great having and attack control, not only the decay. Maybe the root knob could de used for that. That really would open a lot the sound palette!
There is already an “attack” adjustment for the air exciter when you adjust the knob within the air region. From the exciter options section in the manual:
How do you add “attack” to a physical model of a pluck or a mallet?
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Thanks! Need to try it, I missed that parameter 
How to add attack to a plucked instrument? I do that a lot when making sound design, just need a VCA after each voice controlled by a AR or AD envelope.
Edit: Ok I just read how is working the air attack time, seem to me that you are changing the exciter sound. I was asking about shaping the sound after that, shaping plucked instruments as piano, kalimbas, vibraphones with long atta k times makes wonderful and organic pad sounds
But wouldn’t it somehow undermine the “physical modelling fidelity” of Ghosts’ algorythms?
I totally understand that attack manipulation can open the whole variety of new sounds, but I think I see Jaak’s point: when you strike something with a mallet, you can’t “soften the attack”.
I see your point… but I don’t think is undermining… of course you can’t physically have slow attack plucking, but for example guitarist use the built in volume control or volume pedals for shaping sounds.. or an ebow, or real bowing the strings. Then of course in string physical models there are bowed models too not just plucked. Physically I love using bows on the vibraphone and often I use the wond (kind of evolved ebow) in the grand piano or playing gongs with friction.