I’m trying to create custom VST Expression Maps for my personal VSL presets. Something I don’t understand about Expression Maps is “Groups”, and how they interact to create combined articulations.
Say I have two categories of articulations, “Staccatos” and “Portatos”. and both come in two speeds, “Slow” and “Fast”. What I want to do is have a keyswitch decide between Staccato or Portato, and CC12 decide whether it’s the “Slow” or the “Fast” variety.
So I map Staccato to C0 and Portato to C#0, assign them to Group 1, and give them both an attribute of “Direction”. Then, I create two more articulations “Slow” and “Fast”, and assign one to CC12=1, and the other to CC12=127. I also give them attributes of “Direction”, but this time I assign them to Group 2.
What I’m expecting to happen doesn’t happen. Since the “speed” variable belongs to a separate group as the “articulation” variable, I’m expecting to be able to define a speed “Slow” or “Fast” and have this persist no matter which keyswitch I have active.
However, it seems that VST Expressions doesn’t behave like this. In order to combine these in my MIDI track, I have to go back into my expression map and actually create a combination for every possible permutation of Staccato or Portato (ie. Staccato+Short, Staccato+Long, Portato+Short, Portato+Long).
Given the complexity of my personal VSL presets, this would take me forever.
Is there something I am missing?