I've found new uses for this cheap A/B switch, which makes it a really polyvalent tool for your stompboxes chain ...
The stock AB200 is already cool, being dual, relay-based (hence true-bypass) and configurable for latch or momentary. http://behringer.com/AB200/index.cfm
You can use each half as amp or guitar selector, as amp channel footswitch, or as mute for silent tuning ... and if you stomp on both switches you can use it as a true-bypass box or a loop selector.
The first mod is fairly simple, it connects both switches together to ease the last two uses. Just wire a SPST switch between one of the upper pins (facing the jacks) of each tactile switch.
The second mod is also simple on the paper, but a lot more difficult to do. It allows to swap two loops, for example to put your wah before or after the distortion.
Each channel is based on a DPDT relay, 3 jacks, and a semi-discrete latch made with CMOS inverters. The first pole of the relay connects the tip of the IN/OUT jack to the tip of the A or B jack. So far, so good. The second pole connects the tip of the OTHER jack (ie the one not connected to IN/OUT) to ground thru a 100 Ohm resistor. Each channel has its own ground, to avoid noise problems, and only the first channel is used for battery switching.
So we have a total of 4 poles, dual-throw relays in the box, which is all we need for a swap box. http://beavisaudio.com/techpages/PedalH ... itcher.htm
We "just" need to disconnect the grounded contact of each relay, and connect them together with a DPDT switch. Easy for one of them, there's just a copper track to cut, but the other one (acting as battery switch) is connected to the ground plane on both sides of the PCB. So we need to unsolder the relay, which is very difficult as the lead-free solder needs more heat, and the ground planes act as a heatsink !


Or the cheapest flexible AB box
