This is a Boss CE-3 Chorus guitar effects pedal, one of Boss’s classic analog chorus pedals made from 1982–1992.

A chorus pedal thickens your guitar sound by mixing your original signal with a slightly delayed, pitch-modulated copy. The result sounds like multiple guitars playing together.

Common sounds:

• Clean shimmering tones
• 1980s new-wave and rock sounds
• Lush arpeggios
• Rich stereo effects

Controls

Rate

• Controls the speed of the chorus effect.
• Left = slow swirl.
• Right = faster wobble.

Depth

• Controls how intense the chorus effect is.
• Left = subtle.
• Right = deep and watery.

Stereo Mode
The CE-3 was the first Boss chorus with selectable stereo outputs.

Mode I

• Standard stereo chorus.
• Great for two amps.

Mode II

• More dramatic stereo separation.

Mono (using Output A only)

• Regular chorus operation into one amp.

Inputs and Outputs

Input

• Guitar plugs in here.

Output A

• Main output.
• Use this if running one amplifier.

Output B

• Second output for stereo operation.

Power

Your pedal can run on:

• 9-volt battery
• Boss ACA power adapter (older style power supply)

The label on the bottom indicates it was designed for the older Boss ACA adapters.

Your Pedal’s Approximate Age

From the photos:

• Black label style
• Made in Taiwan
• CE-3 production period

Your pedal likely dates from the mid-to-late 1980s.