that part of the manual is for Global output lvl. How to change the level on the preset via the unit?
You may be mistaken. Look for OUTLVL. The global levels are called "Input and Output Swell."
The UM says "Output level is a bit of a different story. It is sometimes desirable to adjust the level of a given Effect/Preset. For example, an effect like Rotary can have wide swells of amplitude and, depending on a given Preset’s parameter settings, you may find it too quiet or too loud. This is a consequence of the effect and not a question of level matching to best fit in a setup. For this reason, Output Level settings can be tweaked and saved with the Preset."
