Mainstage mapping controls to instruments Midi

Hi

I cant find definitions of the various options when I am assigning a control to an instrument. In this case I want to trigger 2 sets of chords. I set them up in the instrument channel strip. In the assigning, I select inst1/chord trigger/ and the next menu gives me a selection of; Bypass, Preset Name, Not-automatable, Chord Transpose, Clear, Learn, Learn Remote, Range-Hi, Range low, Single, multi, Trigger key. ??? Where are these options explained??

I want to send CC12 to trigger one chord, and CC13 to trigger another. When no CC12 or 13, no chord, then either one chord or the other. I am using a Sylphyo wind controller, Help anyone?