Question If I assign an external MIDI controller (or the Alpha Dial) to a parameter (e.g. 'MIX') and, after storage of the Preset, select and recall this Preset, then the parameter starts with '0' (for example: I have no reverb although I've programmed e.g. 40% MIX for reverb). After the first movement of Alpha Dial (or external Controller Slider) I will be able to control the linked parameter correctly.

The setting relative to the position of the Alpha mod wheel or external controllers are not stored in presets. However, by setting the specific parameter in the Edit menu of the specific effect, you can pre-program what the default value should be after a Recall. The first movement of the attached controlled will make the parameter synchronize the parameter value with the external controller.