exclusive 'momentary' buttons? how? *solved*

you know the exclusive button array method:

-row of switch objects, daisy-chained with boolsplitters/mousedown,
 to bool to list. only one can be active at any time: it 'latches' and
 turns any other off. switch image has 'stepped' response in its
 definition file.
>
i can make a momentary latching switch with a inc/dec(wrap), and
the small button graphic('click' response), using a bools to list with
a 'bool led' attached to the 'on' selection (off/on list). so i save this
as my new 'momentary latching switch' prefab.

i now want an array of these, as with the switch daisychain method:
'exclusive', 'latching' operation. any one coming on must switch the
others to their other state, eg: off/not on/

? is this exclusive nor? XNOR/XOR? don't know yet; having a go now;
the trouble i have at the moment is that the selection takes place ok,
but the button led does not stay latched.

more than just the led changing, it actually needs to switch the other
lists 'off'.