Most guitarists will have tweaked each stompbox in a pedal board chain well before the gig starts, and will probably stick to the same bank of available tones for the whole performance. Those in the mood for sonic experimentation, however, might feel tempted to dive down mid-song for a remix using the control knobs on the front of the effects pedal. If you're smart (or quick), no-one will notice. If you had a FLEXeFX pedal or two, though, you wouldn't even have to take your gifted hands away from the guitar at all. You could change your sound on the fly using your foot.
Read the full article: FLEXeFX puts stompbox tone control at your feet