You asked originally if note velocity values could be changed to trim values.
There is no such thing as a trim value in the midi standard. It simply does not exist in the midi domain. So you are left with the other possible ways to affect loudness in the domain of midi. These are: Volume CC, Expression CC, or possibly some proprietary CC unique to your particular VSTi.
There is another possibility, which hasn't been brought up. And that is using audio gain envelopes on the VSTi audio returns. Might be worth considering.
I wish you luck on your quest...
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