User`s guide

tells us that control number 91 sets the e"ect level and
can accept a value between 0 and 127.
After testing the control message by pressing the Send
button, the group of two MIDI messages can be saved as
a MIDI event by clicking the Plus button located under
the Saved MIDI Events list.
Note that before saving, you may change the color of the
event’s marker by choosing a color from the popup menu
under the Saved MIDI Events list.
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130 MIDI! Solo Performer Show Controller User’s Guide