Presets are collections of pin values that are saved on each Layer, Mix and Viewport. Presets are a quick way to save a state for quick recall.
Presets can be saved for Layers, Mixes or Viewports.
Layer Presets save information from each layer such as level, media playing, colour, effects and geometry.
Mix Presets save the mix effects and pixelmapper information and can save some or all layers in that mix.
Viewport Presets save information such as warp, keystone and video mapper assignments.