General
If you're looking for an effect pedal that will give your bass guitar a fuller, more professional sound, then you should definitely check out Behringer's BLE400. This pedal is so effective because it works to increase the softest sounds and decrease peaks for a fuller overall sound. In this way, your dynamics are compressed and you get the kind of balanced tone you hear in professional sound studios. The BLE400 gives you full control over the intonation and dynamics of your bass guitar.
Behringer BLE400: simple operation, complex sound
Level, enhance, ratio and threshold controls give you complete command over the BLE400. Adjust the output volume with the level control, use the enhance dial for clarity and overtones, and adjust the pedal's peak sensitivity with the threshold control. Finally, you can use the ratio control to adjust the intensity of the compression when the sound exceeds a given level.
Compact and resilient
The Behringer BLE400 is a sturdy pedal, so you don't need to worry about damaging it if you get a little excited on stage. It's powered by either a 9V battery or a power adapter (not included), which is nice because you can use it in any type of location, regardless of the power supply (let's just hope your amp is battery-powered too!). It also has an LED status indicator to let you know how the battery's doing.