The Hummingbird is, at heart, a hard and choppy tremolo reminiscent of old valco or vox amps. What comes out is more akin to pinging, vintage synth-style oscillations. It's core is based on the old Vox Repeat Percussion with several unique updates to reduce noise, enhance the "chop" and add more control. It can create everything from ring mod-like octaves, slow pulses, ping pong delay-like stutters, light blipping through machine gun stutter tremolo and beyond! Add some dirt and it absolutely KILLS! The Hummingbird is all analog, true bypass and handmade one at a time on a cloud in Akron, Ohio. Measures4.37″ X 2.37″ X 1.75″ with knobs Power9v Battery or any standard 9 volt DC power supply with a negative center 2.1mm barrel. Controls Depth: Controls amount of modulation from barely there to full signal chop at full bore. Rate: Controls the speed of the LFO. Clockwise for faster, counterclockwise for slower. Level: Controls the signal input level which ultimately controls the output level. Clockwise for more, counterclockwise for less. Mode: Fast/slow switch for LFO rate. Mode 1 is slow, Mode 2 is fast. They do not overlap.