Next Transition Toggle
You can set the next transition selection buttons to either be latching (toggle) or momentary (off). When in toggle mode, pressing one of the next trans buttons (BKGD, KEY1, KEY2, KEY3, KEY 4) toggles it on or off (unless it is the last button - at least one must be selected). When off, pressing one button deselects all other buttons. You must press all the buttons you want to include in the next transition simultaneously.