Many thanks for all the quick and eloquent replies.
Alright, so a Stomp Preset is no more than a specific setup for an FX (a Stomp Type, in KPA nomenclature) that you may fancy using or not at all. This being so I have further queries about them:
1. There are loads of Stomp Presets! 238! Are these Presets simply a specific setup of the particular knobs that come with a given Stomp Type? For instance, if I select Stomp Type Air Chorus I have three knobs specific to that effect for me to tweak to taste: Depth. Crossover &Volume. Now, is a Preset just a specific tweak, a specific "clock-position" of those knobs? Or are they adding an FX on top of the Stomp Type? If it is the latter, and I am pretty convinced it is, wouldn't it be more functional to simply create a chain of Stomps? What is the added-value of having Presets really? Especially if experts will probably prefer to use their own presets rather than factory ones.
2. What if I do not wish any Preset to be activated whatsoever? I cannot seem to be able to use a Stomp Type with no Stomp Preset. I'd like to turn the Stomp Preset functionality off.
3. to experts: do you find factory Stomp Presets any good?