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There are other options. Controllers with knobs are often made for music, but can also be used effectively for stuff like 3D and image/video editing. A popular choice for editing photos is the Behringer X-Touch Mini.

Also, you generally don't want potentiometers for these applications, but rotary encoders. Pots = physical min and max position; encoders = infinite rotation. So for example, when you're switching from one photo to the next, pots would annoyingly keep the old value, while encoders will switch to the correct value. Just a little detail, but it's nice to have to right term to search for.

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