Teac GigaStudio 3 - Manual (Page 122)

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If you are in the Instrument Editor, Make sure the instrument is loaded and playable.
(Green Light is On)
Then [right+click] in the Bank-Instrument area and choose “iMIDI Rule Manager”
from the context Menu.
In the iMIDI Rule window you will see that the Pattern Alternator is already in the
“Active Rules” area.