LinPlug Spectral - Manual (Page 76)

That's all there is to it! From now on you can change the selected
parameter with the chosen controller, Spectral automatically remembers
this forever (or until you delete the assignment or load a different set of
assignments).
You can define up to 123 parameter-controller-combinations. This does not
depend on the type of controller you have nor the particular MIDI Control
Change messages it sends.
Troubleshooting: If Spectral is not responding to a controller it is most
likely that your host software (DAW) is not allowing the MIDI CC Messages
to be send to Spectral; please consult your host software documentation
about how to enable MIDI CC being send to a instrument plugin.
A particular set of assignments can be saved and restored using the Load
and Save functions found in the menu that pops up when you click the MIDI
Learn button. Please note that Spectral always remember what it learned
without the need to save that. However, when you have multiple setups you
use (e.g. Studio and Stage), you might find the Save / Load useful to have
different assignments for the respective setup.
Controller assignments can be removed using the Clear menu entry: select
“Clear” from the menu (the MIDI Learn symbol goes on) and click on all
controls that you wish to be de-assigning it from MIDI Control Change
messages. Don't forget to switch off the Clear function by clicking the “Off”
button after you have finished!
The “Clear All” menu item clears all controller-parameter assignments at
once, effectively disabling change of parameters via MIDI CC messages.
To also suppress the effect of MIDI program change / bank change
messages please check the respective options in the general Spectral
Options .
The “Edit” menu item opens a new window to allow editing the more in
depth details of a controller assignment. The MIDI Controller Assignments
page is described in the next chapter.
Undo / Redo
The next two buttons allow to undo (and redo) parameter changes.
Sometimes when editing a sound you may accidentally change a
parameter or not be happy with the sound you created. If you only changed