@blacklabs Overlay is easy and really useful. Just open any roast from your Roast History, then use Actions>Overlay to make that roast the overlay. A pop-up tells you Overlay Started, which you can just dismiss. Notice that while overlay is active a semi-transparent black button is displayed at the lower left of the screen “Cancel Overlay”. You can use that anytime to turn off overlay.
Now use Return to go back to the main page. You can play with overlay to see what it looks like by opening another roast. Or you can go to the Active Roast and the overlay roast is displayed in the background. Getting an overlay going gives you something to do during preheating.
Overlay makes it really easy to manually operate the controls to mimic what was done in the overlay roast, perhaps with a little longer or shorter intervals here and there if your active roast temperature begins to deviate from the overlay roast temperature.
Overlay is addictive. Once you use it, you can’t live without it