DIY FootController: Gibson Echoplex Digital Pro Plus

Step 4 Check your connections and start solder

Now it is time to doublecheck the pins of your switches so you know which pins you should solder at. The switches themselves are of the type called momentary (closing type), which means that these are only functional as long as you keep them pressed (think sustainpedal for piano). This means that only two of the three pins are the ones that you are interested in, and you need to find out which ones. This is done easy with a multimeter and using the beep function (that you will probably find in even the cheapiest multimeter). Determine which pins that will be in connection when the switches is pressed and solder your leads on these.

By looking at the images here you should be able to see how the "circuit" is realized. The Echoplex sends out an voltage which hits all these serially connected resistors, and it gets a lower voltage back depending on which switch you hit (and thereby are closing the circuit). Based on this the echoplex recognizes which function you are out after.

And as you already got your soldergun warm by now, you could go ahead and solder the 1/4" phonojack aswell.