The choices for MIDI modulation source in Omnisphere include a variety of standard MIDI controllers such as Wheel, Expression, Soft Pedal, etc. You can use these options on the System Page to map those sources to other MIDI controls. This can be useful if you don’t have a particular physical controller such as an Expression Pedal. For example, if you map Wheel to Breath Control, you can use a Breath Controller in any patches that use the Wheel as a modulation source.
To re-map any of these controllers, select a menu in the MODULATION column and move the controller that you want to assign to modulation type.
NOTE: The remapped control will only be visible on the System Page. In the Modulation Matrix and Modulation Source menu of the Edit Page the original Modulation Source name will be shown. For this reason, it’s recommended to use the ‘User CC’ source, since that’s not used in any factory patches.