MXR M102 Dyna Comp

Guitar Mania review:
An industry standard compressor pedal. So, so so simple to use. Very quick and easy to adjust 'on the fly' with big easy-grab knobs. A true classic compressor tone that is perfect for those quacky country links, or funky pop a la Nile Rogers. Often used as a clean boost too.

More info:

• In-line compressor “evens out” the signal to your amplifier
• Useful for increased sustain with stable dynamics
• Nashville studio standard

One of the most popular compressors of all time, the Dyna Comp is the secret weapon on many stars' pedalboards. This box will produce that percussive, clicky sound on a clean guitar that you've heard on so many pop hits. It also adds smooth sustain to lead lines.