On a Roland TR09 (rear view) (Roland's 2016 recreation of their famous TR909):
we can see a stereo volume potentiometer, that is smaller than usual.
Question: Is this
- a normal potentiometer + a "striated" black cap (if so, what is the proper name? I guess striated cap is not the right name, I haven't found anything with this name)
- some small potentiometer with black rubber-looking shaft, all-in-one?
Note: it's not a sourcing question, but I'd like to know what kind of component it is, and the proper name of it (this will allow me to search then).