3 pieces here:

1) Boss VF50-L volume pedal. Light and sturdy.

2) MIDI Mouse. This is what I use to control the effects unit, switching between instruments. It's a simple up/down MIDI control pedal.

3) Peterson Strobe tuner. They are described elsewhere in the Gear section.

actually, one more thing...

4) a clock, attached to the tuner. Every performer ought to know how long he/she's been playing. At a festival this is essential.