I dont think that matters, eg. my favourite exmaple,
the gong synth. If
you issue a voice on it will initialise the gong graph in its stabel
state, and when you sned a velocity signal (or whatever) it will simulate
a beater striking it.
I'd expect it to work quite differently. I'd expect it to initialize a
stable state, and whenever a VOICE_ON comes in, latch the velocity,
beater-hardness, and strike coordinates. Perhaps damping would be a
continuous control.
Each new strike would be a VOICE_ON and each new strike would affect the
global graph. Really it is monophonic. Each new voice inherits state from
the prior voice.