Is it possible to check if the param is pressed (i.e. I’m moving/dragging it, or simply mouseDown on it with mouse stable)?
Because, due to this check, I’d like to draw (::draw()) some stuff instead of others.
Subclass RoundBlackKnob (or whatever you want) and override onDragStart and onDragEnd methods. Remember to call the superclass somewhere in those methods.
The dynamic linker only attempts to link undefined symbols. Redefining Rack symbols in this way is considered “undefined behavior” and should not be attempted.