Marshall Edward ED-1 Compressor

The ED-1 is a guitar compressor pedal that evens out volume differences between louder and softer notes. It can also add sustain and make clean picking feel more controlled.

The ED-1 belongs to Marshall's compact pedal range from the 1990s. Exact production dates can differ across catalog records, so a specific unit's serial number is useful for dating it.

It can affect a bass signal because it is an analog compressor pedal, but it was marketed primarily for guitar. Players should check headroom, frequency response, and noise before using it in a bass setup.

Both are compact compressor pedals, but they have different circuits, controls, and tonal behavior. The ED-1 is a Marshall-branded alternative for players who want compression in the company's older pedal lineup.