Added keyboard to modulation source

[KASA]

I want to reproduce a short envelope in the high range like a piano.
If a keyboard is added to the modulation source, I think it can be reproduced by specifying a decay for the destination.

[LBH]

Hi,

You allready have the Key Dynamics section. You can use that to in example control a partials Decay.

Perhaps it would be nice to have Global parameters as Modulation destinations.