From my understanding many midi voices react upon the velocity parameter in the "note on" command. With a low velocity value (vv) a piano, e.g., sounds mellow or smooth while giving it a vv of, say 127, it may sound harsh or strong, just as a piano sounds when you hit the keys hard.
How can I tell whether a midi voice reacts upon vv (other than actually listening to it)? I'm considering giving my organ bass pedal unit constructed from a SAM2695 and a little STM32F103C8T6 (blue pill) microcontroller an extra potby which I can influence the sound of, e.g. the voice "acoustic bass" a different flavor soundwise.