This is a new Hummingbird from EarthQuaker Devices. The Hummingbird is a choppy, sawtooth tremolo modeled on the vintage “repeat percussion” unit and similar to those found in old Valco and Vox amplifiers. It's capable of producing a wide range of sounds from classic “50’s style” shimmering tremolo to a more synthy, delay-like chop that turns your signal into a burst of short pings and on through to near ring modulation speeds.