If it's Lo-Fi, then some Digital Circuitry can be added - there's plenty out there to chose from.
If it's Hi-Fi, then Digital and semiconductors should be avoided due to inherent junction noise. Then do what everyone else does... nail a gear-wheel to the shaft of your Pot and bolt-on a motor.
This isn't exactly rocket science. Until earlier this year, when I just couldn't be bothered wiping fingerprints off black facias anymore, I had a Pioneer Hi-Fi which I bought when I was a teenager that did exactly that... and guess what... the shiny silver TEAK with en-suite DAB and USB port that replaced it, does exactly the same.
But I remember an old uncle that had a Rigonda (USSR) Gramophone from the 1950's/60's (600 layers of laquer producing mirror-finish wood) that ran on valves, steam and things that got hot. Now this had been manufactured at least 20 years before I ever set foot on this planet with not only motorised volume but also motorised tuning as well. As a kid I'd press the AGC button and watch the dial rotate tune into the nearest FM station all on it's own... spooky stuff... Kinda like Captain Scarlets Mysterons...
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