Mono Input Stereo Output looper?

[simon111]

I want to build a mono input stereo output looper. I want to select between (either-or) a boss ce-1 and a zoom studio rack unit. I want to use both the stereo outputs, and they are both going to the same two amps.

I have searched round and found suitable mono loopers, but I want to switch the stereo outputs as well.

ie.

                                                                                                > Amp 1 Left
                                    > Mono Ce-1  In > Stereo Ce-1 Out L+R 
                                                                                                > Amp 2 Right
Input >   Selector Switch:
                                                                                                > Amp 1 Left
                                   >  Mono Zoom In > Stereo Zoom Out L+R
                                                                                                > Amp 2 Right

NB. I will never want to use both the devices at one time.

Cheers in advance.
Simon.