Electro Harmonix Mainframe Bit Crusher

The pedal has loads of features, letting you explore different way of using downsampling to distort the sound and add different overtones. Especially the option to connect an expression pedal gives you a multitude of options in sound shaping. Especially the filter option is a brilliant touch. Be sure to look through the manual to unlock the full potential of the pedal.
On the downside the knobs are small with very little space in between, and the exp. jack is placed very close to the input jack meaning some cables will not fit at the same time. But these are minor concerns.