[PD] switching signals

[rez]

Hi list.

I'm triying to make a patch to process video, and I need to switch
between three or more signals and the requisite is when you enable one
the others disables.

A boolean table describes it:

signal 1        signal 2      signal 3
     1                     0                 0
     0                     1                 0
     0                     0                 1

Any solution to implement this function??

I'm triying with "route" and "select", but don't works. the selection is
not exclusive.

Thanks.