Earthquaker Devices is known for creating offbeat or strange pedals. Here is an example of accomplishing that goal with subtlety. The Hummingbird is a really fun take on tremolo. Using a sawtooth wave at any of three speed modes you can find a lot of fun, simple, or wacky trem sounds. You can also use it as a clean boost pedal when the Depth knob is at zero.
External Control: EXP
This pedal is straightforward and simple. The depth and rate knobs have an intuitive feel and are easy to pin at a spot that sounds good. The mode switcher is somewhat difficult to see in darker situations.
Although this pedal really only does tremolo, it can have a surprising amount of colors and textures with the three modes and the surprisingly large sweep of the rate knob (or expression pedal).
Clarity of Effect: 4/5
Wonderful clarity. The depth knob does exactly what it should and will saturate your tone as much as you could hope for.
Live application: 2/5
Tremolo is an effect not very well suited for horns, but if you have a use for it, this pedal will work nicely. It gives you more than the standard range of tremolo sounds, and can be a nice source of uncommon textures.