A genius double A/B box for routing two guitars to either of two amps, i.e. you’re out on a gig playing both acoustic and electric guitar, and you for the purpose using two different amp’s, but only the one and same pedalboard.
The solution very simple! connect the two guitar to each instrument in, run the out to the pedal board, then the board out to the Route Box amp select input, from the amp select out’s the each of the two amps, this way you very convenient rout either of your two guitars through the pedal board to either of the two amp’s.