The Harmonic Shifty Vibe is a completely new design from Menatone. The harmonic style of tremolo was made famous by the blonde tolex American amps of the early 60's. This is a reimagining of that sound. The Harmonic Shifty Vibe is actually a optical trem with independant Depth control of the high and low trem. This allows for ultra wet, almost univibe sounds along with subtle ambient spacial effects or anything inbetween. The speed ranges from ultra slow to blazing fast with a very smooth taper throughout the knob range. If you are bored with the standard tremelo pedals out there but still want some movement to your sound this just might be your vibe.