Simple Controller for automating?

I’m looking for simple controler that I can assign parameters to control with a slider (or knob) for doing automation on various things like sends, volume, filters etc…
I was looking at presonus Faderport but the fader isnt assignable

Do you want to use motorized fader for some reason?

If you don’t want to, you can choose any MIDI controller, and solve this as the Generic MIDI Device. If you want to send value of the virtual parametr back on the HW, it’s little bit complicated.