When starting the roast, the beans are at their heaviest, the fan speed can be turned up to keep the beans floating on air and give an even roast. Then, as the beans become lighter, the fan speed can be turned down. The slower the fan, the hotter the roast. But be aware that a lower fan speed will also not loft the beans as well, so you'll want to play with beans volume a bit as well. Roasting different ways produces a different tasting coffee. The combinations can be endless. And. you're in control.
You'll find that a faster roast will give you a lot more snappiness in the cup. You'll also find first and second crack (see our roasting 101) will fall closer together, so listen for that. Faster roast = brighter cup. A slower roast will help to draw out body. If all goes well you'll have adjusted your roaster to exactly the way you like it.
This is a perfect sized roaster of you want to experiment with blends. Blending coffee is almost always done after each kind of bean is roasted. So if you have three components you'll simple do three ~5 ounce batches.
If you're new to home coffee roasting THIS is the roaster to have. It's intuitive, easy to use, quiet, and produces a terrific roast. And it makes a great gift for that coffeehead who has everything :)