Electro Harmonix Pitch Fork Pitch Shifter

I use this in a large rig to actually pitch down my bass guitar an octave.

Usually pitchpedals tend to get wobbley and track worse and worse the lower down in register you go. This one does a really good job with bass frequencies.
I've only played around with it for a short while using the other pitch choices, but they seem really good too.

I bought an expression control pedal at the same time as the pitch fork. That, I do not regret. Works like a whammy. Really cool regardless of guitar or bass playing.

If you don't wanna spend money on one of those, there's a latch function on the pedal. Making the on/off switch momentarily. Really cool idea, and works well if you don't mind the preset speed it pitches up and down.

I can't say anything bad a bout this pedal yet. It's performed flawless so far.