Once you have chosen a controller to use for switching or morphing between upper manual registrations, you can determine the number of preset keys that are affected. You can morph between two and eleven presets for the upper manual.
Morphing always begins with the top preset key, the B.
In Logic Pro, choose a Morph Range pop-up menu value in the Preset Drawbars Morphing section.
When Morph Range pop-up menu value = A#, you morph between two presets.
When Morph Range pop-up menu value = G#, you morph between four presets (B, A#, A, and G).
When Morph Range pop-up menu value = F#, you morph between six presets (and so on).