Furry's fat and long bikes

With the NuVinci you get into the habit of constantly tweeking the shifter according to the terrain. Keeping a nice comfortable constant cadence. Kinda fits with the comfortable cruising style you have to adopt to ride a cargo bike*.
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I'm not sure I understand this bit. So how many gears does it have ? Or is it constantly variable between a range?

Ok. Done some reading. That is very clever.