Lately in a lot of things, especially car stereo, I'm seeing more and more
apparently "digital" knobs (some with pushbutton).  Now, I'm wondering what
they might be called, or where I could find something like them.  They make
great volume controls which can also double as selectors because, unlike
pots, they don't "bottom out" or have a range of motion... but I don't think
I'm telling anyone anything new.

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