Hi Pierre
You record variables like that to curves. In the roast, tap the blue curve button to create a new curve. Set it to "Control" curve. The only downside would be that curves function by a numerical range. You can accomplish what you're after by setting the max value to 100, and then entering 0, 33, 66, 100 throughout the roast to represent off, low, medium and high. Or, come to think of it, maybe setting the max value to 3, and just using 0,1,2,3 to represent those values would be easier. Whatever you choose, it will graph the same, based on the max value you define in the curve.
From there on out, just tap the digital readout on the roast console, with that curve selected, to record a time-stamped entry in the roast.
The update I'm wrapping up at the moment introduces "Curve Templates" to profiles and programs. They're a way to define blank curves that will automatically populate a roast so that you don't have to keep defining them manually over and over again in each roast. I got tired of doing that really quickly in my own roasts.
Thanks for the kind words - I'm glad to hear you're liking it! Any more questions just let me know.
Danny