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Also ordered a new motor for the roaster. The current drum motor is still working, but the manufacturer's tech team thinks that the sound I called about indicates the start capacitor is about to go. This seems plausible to me. If it hasn't failed by the time the replacement part shows up I'm thinking about swapping those early and using the dying motor to test out the possibility of adding a variable speed control.
That's likely less useful than running variable speed on the impeller, but there are a few uses for such a thing and it would let me sort out a better UI/automation for such things in Typica.