If you've never played with a harmonic tremolo pedal, then you definitely need to check out the EarthQuaker Devices Night Wire V2. It splits your signal into high and low frequency ranges and then processes them with an LFO that is split 180 degrees for an intoxicating push-pull effect. Now in its second generation, this version gains a flexi-switch — hold it for momentary operation or tap it to toggle on/off. Tremolo speed can be dialed in with a typical Rate control and can also be controlled by the strength of your pick attack. With Depth set to zero, the Night Wire V2 delivers fixed-filter effects.