bruceb wrote:..... Looking at your roaster controls make me think I am going to have to add some knobs here and there to the Maggio. Do you know what kind of control is used to adjust the current to the heating element? Thanks again for the great report.
I have no specific information on the M3 circuit but, in general, home roasters use a simple dimmer type circuit and this is all you need. If you can find a light dimmer suitable for the relatively high current of your roasters heating element then that would work. If it is near the limit of the current capacity of the dimmer you could add extra heat sink capacity. Quaser Electronics sell a 2000 W dimmer module for GBP21.95 that would be suitablehere. User manual here.
Note that they say that a mains filter should be used to reduce any interference this dimmer can cause. You should, no doubt follow this advice, I would try it first and see if I noticed any interference.