Presets are programs and parameters that have been saved to a file. Chained presets are sequences of presets. We can add one preset to another and then to another, so we can run several presets in one generator. Please check this video about how to use preset chain:

For example, we would like to run Molecular Weight programs and other programs at one generator, so that the generator would not be off after the Molecular programs finished. In this case, you can use Preset Chain. Learn how to do it, please check this video: