How do I make an instrument change volume as I move to higher or lower octaves?

The person who asked this question wanted his patch to get quieter or louder depending on where he played on the keyboard. Using scripter would be one way to do this. But you can also accomplish this with the “Modifier” midi plugin. It takes one piece of midi data and spits it out as something else. In this example, I told it to assign the note number as velocity as that as the note number gets higher, the velocity gets higher. You can take the scale and invert it (-100% here) so that it gets softer as you go higher. I also had to push the “Add” parameter all the way up to get this example to work. You’ll have to adjust the settings to do what you want. You also could just as easily select “Volume” or “Expression” as the re-assigned parameter.