I'm from Slovenia, so you have to excuse my bad english. I choosed to build a programmable pedal switcher on my own, because I have too much pedals on my setup and wanted to simplify switching between presets (pedals, whatever).
The design is basically very simple. Switching between bypass and the loop is done by DPDT relays. Relays are controlled by an AVR microprocessor. Because there is a shortage of I/O pins on the AVR, I included a shift register for the relay controlling. I also included a tuner output, which can be used as a second output (think programmable AB box).
Here's a partial schematic (some names are in slovenian):
And here's a picture of the prototype:
Cheers
From there on it's your choice what's it gonna do. Offcourse there will be a version which will demonstrate all the features that you can do with this pedal. You can connect it with a PC via usb-to-serial and do anything with it: reprogram it, change settings. All depends on your imagination.
Although i'm getting little response from people about it, i'm gonna do it anyway. Schematics and source code will be available, however the PCB files, for practical reasons won't. It's a relatively crowded 2 layer board with 0603 devices and so on. Not DIYable from my point of view anyway.