Say I want to make a couple of old-school paddle controllers. I'd need a couple of proper knobby potentiometers like the ones on this page: http://www.bebek.fi/kauppa/tuotteet.php ... hma_id=280 (apologies for the language, btw. 'akseli' is 'axle', and 'kiinitys' is 'connector', or something. it's a local shop.)
Which ones though? I'm guessing a linear rather than a logarithmic one, but how many Ohms? Why are some of them 2-way?
Also, would it be better to have the ADC chip inside the controller, then a long digital wire to the Pi, or a long wire from the pot to the ADC?