Mapping Discussion

[XORadmin]

I’d like to use a source to modify MIDI velocity for a specific track. In the manual, it seems I can only use MIDI velocity as source, not destination?

Velocity is not a standalone thing but always coupled together with a note and so just sending velocity is impossible.

If you want to define the note velocity of a midi track note of one of the 4 columns then you can use variables. Just decide which variable you want to use to decide the midi notes velocity.
One thing to consider, you got to take care that the variable will never get 0 in the current version as it will lead to a crash. So be sure you always have the variable between 1 and 4095/FFF. That is easy by just add 1 to the variable in the line of the variable destination. I fixed that already in the upcoming version, but for now that is what it is.
Something like choose your sourcevalue.
Next line 'CALC' 'ADD' 'row of sourcevalue  =1'   >  Variable  A as the destination.

And in the midi velocity you choose the Variable as the velocity. Variable values are 1-4095 which end up in velocities from 1 - 100%
If you want to add a bit dynamic, then range your value to like 1 - 80% and add the rest 20% with a random number or something like this.