Boss TU-2

Solid pedal. Um...it works. One thing I have noticed is that in "bass" mode the E string is called "4;" the G string becomes "1." There's a bass player joke hiding in there somewhere.

One of the uses I only stumbled upon after playing with a bigger board is that this is useful as a killswitch. If I'm running a fuzz, a delay, and an overdrive, it's too difficult to tap-dance them all into submission so I don't have an insane hissy-fit at the exact moment a song ends. I can just hit the tuner and then switch everything else off in a leisurely manner before the next tune begins.

It also has a decent buffer, which is nice to have at the beginning and end of signal chains.